<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:df49de55-40f8-4543-96c8-b14dff1303c0,g:59429dad-8921-42ec-b4c8-992e9c0a1919-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.paalp.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="paa-20221231.xsd#CONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/CONSOLIDATEDBALANCESHEETS" xlink:type="extended" id="i82e62fb26ba24adfb4b9ba74ccd3dc7d_CONSOLIDATEDBALANCESHEETS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_a90b95c1-c0c2-4d66-ac94-9dc46cb7b292" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_7e53e809-c7fc-410f-b940-73f0123b1dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_a90b95c1-c0c2-4d66-ac94-9dc46cb7b292" xlink:to="loc_us-gaap_AssetsAbstract_7e53e809-c7fc-410f-b940-73f0123b1dd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_7ca4bf5c-424a-4718-86dd-d6969ca549bb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7e53e809-c7fc-410f-b940-73f0123b1dd2" xlink:to="loc_us-gaap_AssetsCurrentAbstract_7ca4bf5c-424a-4718-86dd-d6969ca549bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_ba9623d8-5bb5-4093-9ef1-347299f8fa7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7ca4bf5c-424a-4718-86dd-d6969ca549bb" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_ba9623d8-5bb5-4093-9ef1-347299f8fa7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReceivablesNetCurrent_32ec9811-de26-412f-8b02-7c1aa7dc11d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReceivablesNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7ca4bf5c-424a-4718-86dd-d6969ca549bb" xlink:to="loc_us-gaap_ReceivablesNetCurrent_32ec9811-de26-412f-8b02-7c1aa7dc11d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_f61875f7-6837-423b-b7d0-36e7badc4f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7ca4bf5c-424a-4718-86dd-d6969ca549bb" xlink:to="loc_us-gaap_InventoryNet_f61875f7-6837-423b-b7d0-36e7badc4f7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_04d2b04e-26cf-4e44-bad6-c48a013d7aee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7ca4bf5c-424a-4718-86dd-d6969ca549bb" xlink:to="loc_us-gaap_OtherAssetsCurrent_04d2b04e-26cf-4e44-bad6-c48a013d7aee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_544c4e0f-d1c3-499a-8a7d-2c33ef9a9ba2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_7ca4bf5c-424a-4718-86dd-d6969ca549bb" xlink:to="loc_us-gaap_AssetsCurrent_544c4e0f-d1c3-499a-8a7d-2c33ef9a9ba2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_5f8f4634-cfb2-4efa-b693-74a5343a9bcf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7e53e809-c7fc-410f-b940-73f0123b1dd2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_5f8f4634-cfb2-4efa-b693-74a5343a9bcf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_e5a35261-25e2-4346-822e-557717902c62" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7e53e809-c7fc-410f-b940-73f0123b1dd2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_e5a35261-25e2-4346-822e-557717902c62" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_3a8d92d1-08d0-47da-a842-a85857a9e981" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7e53e809-c7fc-410f-b940-73f0123b1dd2" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_3a8d92d1-08d0-47da-a842-a85857a9e981" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrentAbstract_c5a97a39-a089-4041-bd71-5a52fe2a00a8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7e53e809-c7fc-410f-b940-73f0123b1dd2" xlink:to="loc_us-gaap_OtherAssetsNoncurrentAbstract_c5a97a39-a089-4041-bd71-5a52fe2a00a8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_b9bf6010-f412-436d-b61a-947c378f8338" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_c5a97a39-a089-4041-bd71-5a52fe2a00a8" xlink:to="loc_us-gaap_EquityMethodInvestments_b9bf6010-f412-436d-b61a-947c378f8338" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d371290d-110b-4e99-bd6a-178dc410ccb5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_c5a97a39-a089-4041-bd71-5a52fe2a00a8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_d371290d-110b-4e99-bd6a-178dc410ccb5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_Linefill_e9f5846a-4ddf-4548-ba1f-44025ff9289a" xlink:href="paa-20221231.xsd#paa_Linefill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_c5a97a39-a089-4041-bd71-5a52fe2a00a8" xlink:to="loc_paa_Linefill_e9f5846a-4ddf-4548-ba1f-44025ff9289a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_5aa89f62-38d4-442b-8355-0dcf3c4f573f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_c5a97a39-a089-4041-bd71-5a52fe2a00a8" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_5aa89f62-38d4-442b-8355-0dcf3c4f573f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNoncurrent_30753876-ed66-4ec0-957a-11ec8e0e27c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_c5a97a39-a089-4041-bd71-5a52fe2a00a8" xlink:to="loc_us-gaap_InventoryNoncurrent_30753876-ed66-4ec0-957a-11ec8e0e27c3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_aa11b6c1-44bb-4615-bac7-e53a0f9d8028" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherAssetsNoncurrentAbstract_c5a97a39-a089-4041-bd71-5a52fe2a00a8" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_aa11b6c1-44bb-4615-bac7-e53a0f9d8028" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_15ce80da-a42e-4764-9542-0404a7c22e35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_7e53e809-c7fc-410f-b940-73f0123b1dd2" xlink:to="loc_us-gaap_Assets_15ce80da-a42e-4764-9542-0404a7c22e35" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3a34f7d5-ac97-4827-8e5a-94aa82b40dec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_a90b95c1-c0c2-4d66-ac94-9dc46cb7b292" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3a34f7d5-ac97-4827-8e5a-94aa82b40dec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_faf4bd7e-3598-4d13-adb4-ba3f76855bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3a34f7d5-ac97-4827-8e5a-94aa82b40dec" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_faf4bd7e-3598-4d13-adb4-ba3f76855bbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableTradeCurrent_9eb31093-c99b-4bfa-ae62-c79db973653a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccountsPayableTradeCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_faf4bd7e-3598-4d13-adb4-ba3f76855bbd" xlink:to="loc_us-gaap_AccountsPayableTradeCurrent_9eb31093-c99b-4bfa-ae62-c79db973653a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_fd25643b-1607-4f83-8099-b2efbdcefc0a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_faf4bd7e-3598-4d13-adb4-ba3f76855bbd" xlink:to="loc_us-gaap_DebtCurrent_fd25643b-1607-4f83-8099-b2efbdcefc0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_05abc7c9-7c30-4dbd-a4fb-53d7f15f142d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_faf4bd7e-3598-4d13-adb4-ba3f76855bbd" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_05abc7c9-7c30-4dbd-a4fb-53d7f15f142d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_e22ed3d1-f357-4cd4-bbb7-2dcb05039483" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_faf4bd7e-3598-4d13-adb4-ba3f76855bbd" xlink:to="loc_us-gaap_LiabilitiesCurrent_e22ed3d1-f357-4cd4-bbb7-2dcb05039483" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_3c15994e-d893-4cb2-9c94-7807a587a91a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3a34f7d5-ac97-4827-8e5a-94aa82b40dec" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_3c15994e-d893-4cb2-9c94-7807a587a91a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorLongTermNotes_af6ab486-44b8-4490-9b26-5a319cd370d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorLongTermNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_3c15994e-d893-4cb2-9c94-7807a587a91a" xlink:to="loc_us-gaap_SeniorLongTermNotes_af6ab486-44b8-4490-9b26-5a319cd370d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_8ab8e746-f621-47d4-874c-d6696ab82a46" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_3c15994e-d893-4cb2-9c94-7807a587a91a" xlink:to="loc_us-gaap_OtherLongTermDebtNoncurrent_8ab8e746-f621-47d4-874c-d6696ab82a46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_ed1d1ecd-55f7-465c-b98b-a10f4204e684" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_3c15994e-d893-4cb2-9c94-7807a587a91a" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_ed1d1ecd-55f7-465c-b98b-a10f4204e684" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_2a00d5e2-6592-4745-a5c0-dcbab832cfa2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_3c15994e-d893-4cb2-9c94-7807a587a91a" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_2a00d5e2-6592-4745-a5c0-dcbab832cfa2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_240d5bd7-4b56-4012-9dc4-4af1c2253b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_3c15994e-d893-4cb2-9c94-7807a587a91a" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_240d5bd7-4b56-4012-9dc4-4af1c2253b1b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_6ef30dd8-08d5-4f0e-b285-386da8712c53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3a34f7d5-ac97-4827-8e5a-94aa82b40dec" xlink:to="loc_us-gaap_CommitmentsAndContingencies_6ef30dd8-08d5-4f0e-b285-386da8712c53" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterestAbstract_47a4fe5b-715c-436d-b2d4-745631f62381" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3a34f7d5-ac97-4827-8e5a-94aa82b40dec" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterestAbstract_47a4fe5b-715c-436d-b2d4-745631f62381" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_53ed9179-b403-4024-9322-bfb23a1f7d33" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterestAbstract_47a4fe5b-715c-436d-b2d4-745631f62381" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccount_53ed9179-b403-4024-9322-bfb23a1f7d33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_723eaf17-d302-4b64-853e-ec5dd121d307" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterestAbstract_47a4fe5b-715c-436d-b2d4-745631f62381" xlink:to="loc_us-gaap_PartnersCapital_723eaf17-d302-4b64-853e-ec5dd121d307" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_d1e30909-0893-4ff8-a1e4-d71cbb954d7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterestAbstract_47a4fe5b-715c-436d-b2d4-745631f62381" xlink:to="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_d1e30909-0893-4ff8-a1e4-d71cbb954d7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_dd88870f-0559-4ebe-8d2e-2bb85cc00d3c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterestAbstract_47a4fe5b-715c-436d-b2d4-745631f62381" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_dd88870f-0559-4ebe-8d2e-2bb85cc00d3c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_bfc173ca-7b5e-46ff-a55b-9a761bbddfd2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_3a34f7d5-ac97-4827-8e5a-94aa82b40dec" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_bfc173ca-7b5e-46ff-a55b-9a761bbddfd2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_916b2e07-ace7-4cfb-8c4f-1668d36eab46" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_a90b95c1-c0c2-4d66-ac94-9dc46cb7b292" xlink:to="loc_us-gaap_StatementTable_916b2e07-ace7-4cfb-8c4f-1668d36eab46" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f3300432-7a90-4044-9d8c-d0a7ac967516" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_916b2e07-ace7-4cfb-8c4f-1668d36eab46" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f3300432-7a90-4044-9d8c-d0a7ac967516" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f3300432-7a90-4044-9d8c-d0a7ac967516_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f3300432-7a90-4044-9d8c-d0a7ac967516" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f3300432-7a90-4044-9d8c-d0a7ac967516_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_a4dd1ffe-5949-46e7-8d63-7a6573f4627f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f3300432-7a90-4044-9d8c-d0a7ac967516" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_a4dd1ffe-5949-46e7-8d63-7a6573f4627f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_5b87c9fd-4d23-4492-9b30-166492a63605" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_a4dd1ffe-5949-46e7-8d63-7a6573f4627f" xlink:to="loc_paa_SeriesAPreferredUnitsMember_5b87c9fd-4d23-4492-9b30-166492a63605" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesBPreferredUnitsMember_59f2ebea-e8cd-4a17-89bf-2db5851ee69f" xlink:href="paa-20221231.xsd#paa_SeriesBPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_a4dd1ffe-5949-46e7-8d63-7a6573f4627f" xlink:to="loc_paa_SeriesBPreferredUnitsMember_59f2ebea-e8cd-4a17-89bf-2db5851ee69f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_09a682a6-d4a7-4834-9fcb-ad19eb01a0b1" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_a4dd1ffe-5949-46e7-8d63-7a6573f4627f" xlink:to="loc_paa_CommonUnitsMember_09a682a6-d4a7-4834-9fcb-ad19eb01a0b1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="paa-20221231.xsd#CONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/CONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended" id="i9ac826aa32db4835b09bea4763f3b8b0_CONSOLIDATEDBALANCESHEETSParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_d6e4a238-b6d8-418b-b94a-77073c4bc620" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_84181d72-c92c-4b76-b733-ee7505b7d576" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_d6e4a238-b6d8-418b-b94a-77073c4bc620" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_84181d72-c92c-4b76-b733-ee7505b7d576" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_1652fca2-081f-486d-953e-3b60398ec3eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_d6e4a238-b6d8-418b-b94a-77073c4bc620" xlink:to="loc_us-gaap_StatementTable_1652fca2-081f-486d-953e-3b60398ec3eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_313f0f4b-52a0-4771-9186-736b78c30fa5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_1652fca2-081f-486d-953e-3b60398ec3eb" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_313f0f4b-52a0-4771-9186-736b78c30fa5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_313f0f4b-52a0-4771-9186-736b78c30fa5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_313f0f4b-52a0-4771-9186-736b78c30fa5" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_313f0f4b-52a0-4771-9186-736b78c30fa5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_2cc3a454-071f-4985-9063-bb527987027d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_313f0f4b-52a0-4771-9186-736b78c30fa5" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_2cc3a454-071f-4985-9063-bb527987027d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_848a2bca-bad4-46de-ab8a-d7d7132bccb2" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_2cc3a454-071f-4985-9063-bb527987027d" xlink:to="loc_paa_SeriesAPreferredUnitsMember_848a2bca-bad4-46de-ab8a-d7d7132bccb2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesBPreferredUnitsMember_c9552041-af33-4718-8967-a6e0df7d1804" xlink:href="paa-20221231.xsd#paa_SeriesBPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_2cc3a454-071f-4985-9063-bb527987027d" xlink:to="loc_paa_SeriesBPreferredUnitsMember_c9552041-af33-4718-8967-a6e0df7d1804" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_25be42b0-28ce-4e5a-8927-5c9e22401a12" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_2cc3a454-071f-4985-9063-bb527987027d" xlink:to="loc_paa_CommonUnitsMember_25be42b0-28ce-4e5a-8927-5c9e22401a12" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="simple" xlink:href="paa-20221231.xsd#CONSOLIDATEDSTATEMENTSOFOPERATIONS"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/CONSOLIDATEDSTATEMENTSOFOPERATIONS" xlink:type="extended" id="i864cbd11a7954b2bbe346fc0ed36cbbf_CONSOLIDATEDSTATEMENTSOFOPERATIONS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_ace17614-9443-45aa-ae6c-6a7d04856e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_RevenuesAbstract_ace17614-9443-45aa-ae6c-6a7d04856e0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_a1a466c6-3507-4c98-86a2-66563b9f6768" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_ace17614-9443-45aa-ae6c-6a7d04856e0d" xlink:to="loc_us-gaap_Revenues_a1a466c6-3507-4c98-86a2-66563b9f6768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_0f3ddfea-84c3-40d4-8197-8f93349f33de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_0f3ddfea-84c3-40d4-8197-8f93349f33de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingCostsAndExpenses_a0ddbfd5-d7e7-4d0f-96de-0fa6d38316ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingCostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:to="loc_us-gaap_OperatingCostsAndExpenses_a0ddbfd5-d7e7-4d0f-96de-0fa6d38316ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_d47f2d8c-6109-44fa-88ff-d84e1b893f8f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_d47f2d8c-6109-44fa-88ff-d84e1b893f8f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_cd2aae63-fa9a-43d8-b1e7-ea3392877236" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_cd2aae63-fa9a-43d8-b1e7-ea3392877236" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_678ae161-0e5a-4716-bb6b-d2922ee46d2a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_678ae161-0e5a-4716-bb6b-d2922ee46d2a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_0975b57c-ebac-4f37-982c-502f2aff7104" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_0975b57c-ebac-4f37-982c-502f2aff7104" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_8d84a46f-8b0d-4719-b8fa-2df3f2db7048" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_f645bdcc-54d6-4879-af98-932bd37ab451" xlink:to="loc_us-gaap_CostsAndExpenses_8d84a46f-8b0d-4719-b8fa-2df3f2db7048" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_1542d00a-092c-45a0-a314-bb89f71f7273" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_OperatingIncomeLoss_1542d00a-092c-45a0-a314-bb89f71f7273" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_bad51980-3e89-405f-8709-2f87473dc2f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_bad51980-3e89-405f-8709-2f87473dc2f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_a3b1f45d-7522-4aed-9dc6-e9a1ad138099" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_bad51980-3e89-405f-8709-2f87473dc2f9" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_a3b1f45d-7522-4aed-9dc6-e9a1ad138099" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet_410824d3-0aa1-450f-aabd-73ceab865823" xlink:href="paa-20221231.xsd#paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_bad51980-3e89-405f-8709-2f87473dc2f9" xlink:to="loc_paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet_410824d3-0aa1-450f-aabd-73ceab865823" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_4d497ac1-4b55-4804-8579-4212fb9c9566" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_bad51980-3e89-405f-8709-2f87473dc2f9" xlink:to="loc_us-gaap_InterestExpense_4d497ac1-4b55-4804-8579-4212fb9c9566" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_7f4f2718-5813-4548-8596-99df65d02ce1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_bad51980-3e89-405f-8709-2f87473dc2f9" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_7f4f2718-5813-4548-8596-99df65d02ce1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_925c3c8d-d6a2-4cd3-9fa1-2e418a5373e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_925c3c8d-d6a2-4cd3-9fa1-2e418a5373e1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_60ec555b-24ed-4c00-bbd5-fe8b8bf49c0f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_60ec555b-24ed-4c00-bbd5-fe8b8bf49c0f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_3c974ca7-cfb4-4bcc-b465-85d489dc6a55" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_3c974ca7-cfb4-4bcc-b465-85d489dc6a55" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_4c4bd20c-f53a-4e7f-a236-089a827bcc3c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_ProfitLoss_4c4bd20c-f53a-4e7f-a236-089a827bcc3c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_64771e60-31ec-4553-bd6e-6af73e65a8e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_64771e60-31ec-4553-bd6e-6af73e65a8e9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_2eb35136-c2a8-4fed-aa4d-f97bddedf6ba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_NetIncomeLoss_2eb35136-c2a8-4fed-aa4d-f97bddedf6ba" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerUnitAbstract_910ff0c5-fd0b-46e7-be8f-eef884730b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerUnitAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_EarningsPerUnitAbstract_910ff0c5-fd0b-46e7-be8f-eef884730b4e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NetIncomeLossAllocatedToCommonUnitholdersBasic_d04ba14c-f471-4ed4-bf88-0565ad4bb736" xlink:href="paa-20221231.xsd#paa_NetIncomeLossAllocatedToCommonUnitholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerUnitAbstract_910ff0c5-fd0b-46e7-be8f-eef884730b4e" xlink:to="loc_paa_NetIncomeLossAllocatedToCommonUnitholdersBasic_d04ba14c-f471-4ed4-bf88-0565ad4bb736" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NetIncomeLossAllocatedToCommonUnitholdersDiluted_3759c249-4891-4906-8ba3-534ac71d7f72" xlink:href="paa-20221231.xsd#paa_NetIncomeLossAllocatedToCommonUnitholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerUnitAbstract_910ff0c5-fd0b-46e7-be8f-eef884730b4e" xlink:to="loc_paa_NetIncomeLossAllocatedToCommonUnitholdersDiluted_3759c249-4891-4906-8ba3-534ac71d7f72" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding_871e345c-91a4-40e6-ae7d-c6a78c3baad3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerUnitAbstract_910ff0c5-fd0b-46e7-be8f-eef884730b4e" xlink:to="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding_871e345c-91a4-40e6-ae7d-c6a78c3baad3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted_5b5075cf-1649-4f4c-bddf-6dffbeacd46e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerUnitAbstract_910ff0c5-fd0b-46e7-be8f-eef884730b4e" xlink:to="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted_5b5075cf-1649-4f4c-bddf-6dffbeacd46e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax_64e0fb47-38e0-4e7f-94b2-973be832b59d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerUnitAbstract_910ff0c5-fd0b-46e7-be8f-eef884730b4e" xlink:to="loc_us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax_64e0fb47-38e0-4e7f-94b2-973be832b59d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted_fb7b675d-5c88-4be7-9358-79b73ef3b478" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerUnitAbstract_910ff0c5-fd0b-46e7-be8f-eef884730b4e" xlink:to="loc_us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted_fb7b675d-5c88-4be7-9358-79b73ef3b478" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_78dc0963-dfee-478e-bada-482bc0577451" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_4b45fc5e-43b2-4f77-9f7d-5b7d78cae227" xlink:to="loc_us-gaap_StatementTable_78dc0963-dfee-478e-bada-482bc0577451" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_58bc828c-c220-47b4-9eb5-fed530d1cba4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_78dc0963-dfee-478e-bada-482bc0577451" xlink:to="loc_srt_ProductOrServiceAxis_58bc828c-c220-47b4-9eb5-fed530d1cba4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_58bc828c-c220-47b4-9eb5-fed530d1cba4_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_58bc828c-c220-47b4-9eb5-fed530d1cba4" xlink:to="loc_srt_ProductsAndServicesDomain_58bc828c-c220-47b4-9eb5-fed530d1cba4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_8f507a29-ff26-474e-90b1-fab174348eb2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_58bc828c-c220-47b4-9eb5-fed530d1cba4" xlink:to="loc_srt_ProductsAndServicesDomain_8f507a29-ff26-474e-90b1-fab174348eb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_2b903dc3-029d-4bda-90dd-c32888a8bb38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_8f507a29-ff26-474e-90b1-fab174348eb2" xlink:to="loc_us-gaap_ProductMember_2b903dc3-029d-4bda-90dd-c32888a8bb38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_dc0a4521-c1d0-49a1-8eb9-4ca32022d612" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_8f507a29-ff26-474e-90b1-fab174348eb2" xlink:to="loc_us-gaap_ServiceMember_dc0a4521-c1d0-49a1-8eb9-4ca32022d612" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_91830f9f-d7b5-4474-8c4f-5769ba06c4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_78dc0963-dfee-478e-bada-482bc0577451" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_91830f9f-d7b5-4474-8c4f-5769ba06c4f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_91830f9f-d7b5-4474-8c4f-5769ba06c4f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_91830f9f-d7b5-4474-8c4f-5769ba06c4f6" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_91830f9f-d7b5-4474-8c4f-5769ba06c4f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_5e5cefe7-fea6-4528-bcd7-f8b5fd6d0ab8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_91830f9f-d7b5-4474-8c4f-5769ba06c4f6" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_5e5cefe7-fea6-4528-bcd7-f8b5fd6d0ab8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_bc159a97-e8bf-4e20-bef8-d74695ad7773" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_5e5cefe7-fea6-4528-bcd7-f8b5fd6d0ab8" xlink:to="loc_paa_CommonUnitsMember_bc159a97-e8bf-4e20-bef8-d74695ad7773" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS" xlink:type="simple" xlink:href="paa-20221231.xsd#CONSOLIDATEDSTATEMENTSOFCHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS" xlink:type="extended" id="idfb0284dff81409cb2d87a0b16c43852_CONSOLIDATEDSTATEMENTSOFCHANGESINACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_93e007d3-0347-4c73-9f46-2c99709f43a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_90439f60-661c-4a06-9406-adce8267caf5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_93e007d3-0347-4c73-9f46-2c99709f43a7" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_90439f60-661c-4a06-9406-adce8267caf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_836c3b89-cd54-4ee6-80dd-2e344deaf8a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_90439f60-661c-4a06-9406-adce8267caf5" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_836c3b89-cd54-4ee6-80dd-2e344deaf8a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_71b3c0a4-22de-4b4c-a07e-089eb4839422" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_90439f60-661c-4a06-9406-adce8267caf5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_71b3c0a4-22de-4b4c-a07e-089eb4839422" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_4ae970f2-299c-4099-b2ca-a1378d3ebe6b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_90439f60-661c-4a06-9406-adce8267caf5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_4ae970f2-299c-4099-b2ca-a1378d3ebe6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_15b1feec-c761-4f5f-b573-02a1d8aeb2d3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_90439f60-661c-4a06-9406-adce8267caf5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_15b1feec-c761-4f5f-b573-02a1d8aeb2d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeOtherNetOfTax_cb5ae749-7353-45f1-b931-038e0eb46d4a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeOtherNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_90439f60-661c-4a06-9406-adce8267caf5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeOtherNetOfTax_cb5ae749-7353-45f1-b931-038e0eb46d4a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_473d94b9-bcd9-4174-941e-0908b29c1e2c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_90439f60-661c-4a06-9406-adce8267caf5" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_473d94b9-bcd9-4174-941e-0908b29c1e2c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_20eb3e9b-5315-4220-aef9-2fea5cb07f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_3696a1aa-7aab-4833-842e-9a7b2c115ed5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_93e007d3-0347-4c73-9f46-2c99709f43a7" xlink:to="loc_us-gaap_StatementTable_3696a1aa-7aab-4833-842e-9a7b2c115ed5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_1a914bd2-0bea-47e9-b94c-a91c239b8c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_3696a1aa-7aab-4833-842e-9a7b2c115ed5" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_1a914bd2-0bea-47e9-b94c-a91c239b8c5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_1a914bd2-0bea-47e9-b94c-a91c239b8c5a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_1a914bd2-0bea-47e9-b94c-a91c239b8c5a" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_1a914bd2-0bea-47e9-b94c-a91c239b8c5a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_7cbac1e3-6818-4824-8a7b-2ef9d64c638c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_1a914bd2-0bea-47e9-b94c-a91c239b8c5a" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_7cbac1e3-6818-4824-8a7b-2ef9d64c638c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_e2ec4112-94ec-48ab-b3b6-fe654669c3fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_7cbac1e3-6818-4824-8a7b-2ef9d64c638c" xlink:to="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_e2ec4112-94ec-48ab-b3b6-fe654669c3fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_36124173-3b76-4804-a7c4-645d734778c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_7cbac1e3-6818-4824-8a7b-2ef9d64c638c" xlink:to="loc_us-gaap_AccumulatedForeignCurrencyAdjustmentIncludingPortionAttributableToNoncontrollingInterestMember_36124173-3b76-4804-a7c4-645d734778c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AOCIOtherIncludingPortionAttributabletoNoncontrollingInterestMember_8a14814b-e0b4-42b4-a3a4-6a5e00f1d9ed" xlink:href="paa-20221231.xsd#paa_AOCIOtherIncludingPortionAttributabletoNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_7cbac1e3-6818-4824-8a7b-2ef9d64c638c" xlink:to="loc_paa_AOCIOtherIncludingPortionAttributabletoNoncontrollingInterestMember_8a14814b-e0b4-42b4-a3a4-6a5e00f1d9ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_af2d8bd5-1df0-4889-b971-587fa0cd3e44" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_7cbac1e3-6818-4824-8a7b-2ef9d64c638c" xlink:to="loc_us-gaap_AociIncludingPortionAttributableToNoncontrollingInterestMember_af2d8bd5-1df0-4889-b971-587fa0cd3e44" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="simple" xlink:href="paa-20221231.xsd#CONSOLIDATEDSTATEMENTSOFCASHFLOWS"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS" xlink:type="extended" id="ia973b8eb2e4840ceb64082cbe5af25b8_CONSOLIDATEDSTATEMENTSOFCASHFLOWS">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_125bec5f-6059-43b5-9278-76acdbafa6b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_125bec5f-6059-43b5-9278-76acdbafa6b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_c6099600-45dd-49b9-bf24-5012ed0fe1dd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_125bec5f-6059-43b5-9278-76acdbafa6b4" xlink:to="loc_us-gaap_ProfitLoss_c6099600-45dd-49b9-bf24-5012ed0fe1dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_125bec5f-6059-43b5-9278-76acdbafa6b4" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_1a569696-27dc-4766-87f6-289630407289" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_1a569696-27dc-4766-87f6-289630407289" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_363f2b8e-c180-4df7-88bf-6b07693e4189" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_363f2b8e-c180-4df7-88bf-6b07693e4189" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_e2041774-65a2-407e-841f-7f4d850f767f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_e2041774-65a2-407e-841f-7f4d850f767f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_1aacc325-e49c-463c-bc22-2a7b5d140415" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_1aacc325-e49c-463c-bc22-2a7b5d140415" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWriteDown_ed3a774a-66d3-4349-933b-221f90a85dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryWriteDown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_InventoryWriteDown_ed3a774a-66d3-4349-933b-221f90a85dd6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_07da1175-f8fa-43e7-b0c0-08e990c3dae0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_07da1175-f8fa-43e7-b0c0-08e990c3dae0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainLossOnSalesOfLinefill_a0fbc3d9-2520-488b-b720-9a213d3dac2d" xlink:href="paa-20221231.xsd#paa_GainLossOnSalesOfLinefill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_paa_GainLossOnSalesOfLinefill_a0fbc3d9-2520-488b-b720-9a213d3dac2d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_5456be2d-38d1-450d-a333-52ab5ea6b322" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_5456be2d-38d1-450d-a333-52ab5ea6b322" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NetCashPaidReceivedforTerminatedHedgingInstruments_3ebde03f-d68f-474a-bdbc-128a6f3c7c6e" xlink:href="paa-20221231.xsd#paa_NetCashPaidReceivedforTerminatedHedgingInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_paa_NetCashPaidReceivedforTerminatedHedgingInstruments_3ebde03f-d68f-474a-bdbc-128a6f3c7c6e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_d655c19b-5918-4c18-ba54-4a85204414b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_d655c19b-5918-4c18-ba54-4a85204414b3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_d5834b24-413b-4cbc-a873-e2b9e844dd76" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_d5834b24-413b-4cbc-a873-e2b9e844dd76" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_a8284f34-3774-4761-add4-487e45a81159" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentDividendsOrDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_EquityMethodInvestmentDividendsOrDistributions_a8284f34-3774-4761-add4-487e45a81159" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet_14bd94ea-5e34-449c-a2d2-fbf2e2f5d7a2" xlink:href="paa-20221231.xsd#paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet_14bd94ea-5e34-449c-a2d2-fbf2e2f5d7a2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_0fb4db26-647d-478d-97fe-2b983c9a8756" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_0fb4db26-647d-478d-97fe-2b983c9a8756" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_de25e475-33ea-4aa6-b41b-cd36bc15a903" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_de25e475-33ea-4aa6-b41b-cd36bc15a903" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_61e0298b-8317-4e54-abc2-9e266497b31d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_de25e475-33ea-4aa6-b41b-cd36bc15a903" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables_61e0298b-8317-4e54-abc2-9e266497b31d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_5ef494de-dd25-447b-aaa2-0138b1481cb1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_de25e475-33ea-4aa6-b41b-cd36bc15a903" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_5ef494de-dd25-447b-aaa2-0138b1481cb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_a0502c75-fede-4c98-bdb8-4c97b5074f55" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_de25e475-33ea-4aa6-b41b-cd36bc15a903" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_a0502c75-fede-4c98-bdb8-4c97b5074f55" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d0f918b1-2438-464d-a664-ae6b88dbe56b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_4f76f8d9-ac13-410d-86aa-9ba53b8d1f74" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_d0f918b1-2438-464d-a664-ae6b88dbe56b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_9ee819a8-85b2-4706-8a70-d3d4cc2c977a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_9ee819a8-85b2-4706-8a70-d3d4cc2c977a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CapitalContributionsToEquityMethodInvestees_94e591b5-cc9a-4adf-9633-0b9451b155d9" xlink:href="paa-20221231.xsd#paa_CapitalContributionsToEquityMethodInvestees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:to="loc_paa_CapitalContributionsToEquityMethodInvestees_94e591b5-cc9a-4adf-9633-0b9451b155d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_9efae333-3c55-421e-ab2e-a83857d99f76" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_9efae333-3c55-421e-ab2e-a83857d99f76" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_4aa7eea7-8d7b-414f-baf0-63a84c55fd48" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_4aa7eea7-8d7b-414f-baf0-63a84c55fd48" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CashReceivedRelatedToSalesOfLinefill_6ce1baac-70e7-4398-a8ca-c450fd53c5c1" xlink:href="paa-20221231.xsd#paa_CashReceivedRelatedToSalesOfLinefill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:to="loc_paa_CashReceivedRelatedToSalesOfLinefill_6ce1baac-70e7-4398-a8ca-c450fd53c5c1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CashPaidRelatedToPurchasesOfLinefill_3321de81-955e-4eb4-b8fe-296bac7849c9" xlink:href="paa-20221231.xsd#paa_CashPaidRelatedToPurchasesOfLinefill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:to="loc_paa_CashPaidRelatedToPurchasesOfLinefill_3321de81-955e-4eb4-b8fe-296bac7849c9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_0b1f5878-8fa4-4897-b1dc-303011980386" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_0b1f5878-8fa4-4897-b1dc-303011980386" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1284505c-709b-49e5-aba9-47fd5cc1290d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_a021a786-b193-4cb2-9d88-d4f8206a2e4c" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_1284505c-709b-49e5-aba9-47fd5cc1290d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_eeeec755-6629-4249-b626-da634321179a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromRepaymentsOfCommercialPaper"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfCommercialPaper_eeeec755-6629-4249-b626-da634321179a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NetProceedsFromRepaymentsOfHedgedInventoryFacility_fbca28ba-2e40-4874-8b72-90e351eded79" xlink:href="paa-20221231.xsd#paa_NetProceedsFromRepaymentsOfHedgedInventoryFacility"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_paa_NetProceedsFromRepaymentsOfHedgedInventoryFacility_fbca28ba-2e40-4874-8b72-90e351eded79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt_f1513ed3-897d-4ae5-88fc-add9173f66ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_RepaymentsOfSecuredDebt_f1513ed3-897d-4ae5-88fc-add9173f66ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_867868fb-ae51-4fb1-ad10-f9d24413b96c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt_867868fb-ae51-4fb1-ad10-f9d24413b96c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_d6c287bf-4505-43ef-bd9e-0bc943352a7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfSeniorDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_d6c287bf-4505-43ef-bd9e-0bc943352a7d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_5ae8379b-6bc9-479e-aeb2-a2fe3ea4b79d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_5ae8379b-6bc9-479e-aeb2-a2fe3ea4b79d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_5e6784ec-c3d5-4c18-9f17-e225a2459cdb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_5e6784ec-c3d5-4c18-9f17-e225a2459cdb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_97646a11-600c-4d3b-9b22-25cdbffafc50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_97646a11-600c-4d3b-9b22-25cdbffafc50" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ProceedsFromContributionsFromNoncontrollingInterests_7e3926cf-a921-4c4a-afdf-8c93a6596299" xlink:href="paa-20221231.xsd#paa_ProceedsFromContributionsFromNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_paa_ProceedsFromContributionsFromNoncontrollingInterests_7e3926cf-a921-4c4a-afdf-8c93a6596299" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_47296e4b-bfa1-4f39-a358-97ca64a1ffa6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_47296e4b-bfa1-4f39-a358-97ca64a1ffa6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_11c04965-2374-4d3c-a079-1af24d971d9d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_c04b373b-7a98-411e-8097-0bb6784f8afc" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_11c04965-2374-4d3c-a079-1af24d971d9d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_cbaa80ec-52b7-40e7-9e8d-7a27942c8c18" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_cbaa80ec-52b7-40e7-9e8d-7a27942c8c18" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_831aa6aa-5e27-49e3-bf95-0f084b588cee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_831aa6aa-5e27-49e3-bf95-0f084b588cee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f597b82f-bcd2-4390-8d75-62e441d362ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_f597b82f-bcd2-4390-8d75-62e441d362ad" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_7bfa87be-36c6-4ea4-b82e-ec925efd91c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_70e4ccb5-1696-4311-b4d8-377d844eda8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_70e4ccb5-1696-4311-b4d8-377d844eda8e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_10bc6063-a1a6-442b-baf1-1982ce5cd7d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_70e4ccb5-1696-4311-b4d8-377d844eda8e" xlink:to="loc_us-gaap_InterestPaidNet_10bc6063-a1a6-442b-baf1-1982ce5cd7d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_2015fbf1-e874-4b7e-b1d4-2abbf0f3893f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_70e4ccb5-1696-4311-b4d8-377d844eda8e" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_2015fbf1-e874-4b7e-b1d4-2abbf0f3893f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_96314122-426d-4af7-b5de-c3381ed9d57d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_45b805c0-0fa2-4d13-a39d-8d9a8631c524" xlink:to="loc_us-gaap_StatementTable_96314122-426d-4af7-b5de-c3381ed9d57d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_b0bbe1a5-298b-4fe5-8306-3bafb755a9ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_96314122-426d-4af7-b5de-c3381ed9d57d" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_b0bbe1a5-298b-4fe5-8306-3bafb755a9ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_b0bbe1a5-298b-4fe5-8306-3bafb755a9ad_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_b0bbe1a5-298b-4fe5-8306-3bafb755a9ad" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_b0bbe1a5-298b-4fe5-8306-3bafb755a9ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_93fc946b-3ee5-4353-80ac-b80921166202" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_b0bbe1a5-298b-4fe5-8306-3bafb755a9ad" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_93fc946b-3ee5-4353-80ac-b80921166202" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_06076773-585f-40bc-92ae-a34487b09be9" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_93fc946b-3ee5-4353-80ac-b80921166202" xlink:to="loc_paa_SeriesAPreferredUnitsMember_06076773-585f-40bc-92ae-a34487b09be9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesBPreferredUnitsMember_7cda09dd-b790-4781-a41a-98f10be05447" xlink:href="paa-20221231.xsd#paa_SeriesBPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_93fc946b-3ee5-4353-80ac-b80921166202" xlink:to="loc_paa_SeriesBPreferredUnitsMember_7cda09dd-b790-4781-a41a-98f10be05447" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_ee3ab2d2-1b9b-4dca-a892-280ab8afd23a" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_93fc946b-3ee5-4353-80ac-b80921166202" xlink:to="loc_paa_CommonUnitsMember_ee3ab2d2-1b9b-4dca-a892-280ab8afd23a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPARTNERSCAPITAL" xlink:type="simple" xlink:href="paa-20221231.xsd#CONSOLIDATEDSTATEMENTSOFCHANGESINPARTNERSCAPITAL"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINPARTNERSCAPITAL" xlink:type="extended" id="i04bef444148d4dc19c52650ed006e0a5_CONSOLIDATEDSTATEMENTSOFCHANGESINPARTNERSCAPITAL">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_a35f5926-def3-44bc-94a3-e985b95597e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInPartnersCapitalRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_a35f5926-def3-44bc-94a3-e985b95597e9" xlink:to="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_39abf368-cedb-475d-98cb-a990200799f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_39abf368-cedb-475d-98cb-a990200799f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_c7adc584-7e4c-4f58-84d0-d14addf544b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_ProfitLoss_c7adc584-7e4c-4f58-84d0-d14addf544b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountDistributions_17ae7220-7976-41d1-ab9c-0a919ba7e9e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_PartnersCapitalAccountDistributions_17ae7220-7976-41d1-ab9c-0a919ba7e9e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e460545f-b869-4409-af4e-21b167550586" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_e460545f-b869-4409-af4e-21b167550586" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountUnitBasedCompensation_d0c2fbaf-c996-4115-8953-68e9d1a62b64" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountUnitBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_PartnersCapitalAccountUnitBasedCompensation_d0c2fbaf-c996-4115-8953-68e9d1a62b64" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_02cabe9d-8377-4495-b3dd-cba894798a02" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_02cabe9d-8377-4495-b3dd-cba894798a02" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountContributions_e8861e59-d640-43bc-8e8d-fe408e598599" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountContributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_PartnersCapitalAccountContributions_e8861e59-d640-43bc-8e8d-fe408e598599" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountAcquisitions_a2bb7a58-b806-4d91-8fd6-397c337e0e69" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_PartnersCapitalAccountAcquisitions_a2bb7a58-b806-4d91-8fd6-397c337e0e69" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalOther_d2992ff0-f996-4d2e-b04e-a50a85a98709" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_c7834a46-e115-4bfa-8a91-cadac10138ad" xlink:to="loc_us-gaap_PartnersCapitalOther_d2992ff0-f996-4d2e-b04e-a50a85a98709" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest_a29cc8f3-f7d0-461f-b1ca-a58b2e18dbcc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_82380959-5e82-41a2-9c90-5e2d0b32aef6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_a35f5926-def3-44bc-94a3-e985b95597e9" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_82380959-5e82-41a2-9c90-5e2d0b32aef6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_a35f5926-def3-44bc-94a3-e985b95597e9" xlink:to="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_6d5d4da4-825a-450b-a0f0-3f9a8785c61a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_6d5d4da4-825a-450b-a0f0-3f9a8785c61a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_6d5d4da4-825a-450b-a0f0-3f9a8785c61a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_6d5d4da4-825a-450b-a0f0-3f9a8785c61a" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_6d5d4da4-825a-450b-a0f0-3f9a8785c61a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_42293ce6-26a5-4301-8549-930bcbe32ef2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_6d5d4da4-825a-450b-a0f0-3f9a8785c61a" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_42293ce6-26a5-4301-8549-930bcbe32ef2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnerMember_650626ea-2bb6-48ce-b335-d5845de45ccc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_42293ce6-26a5-4301-8549-930bcbe32ef2" xlink:to="loc_us-gaap_LimitedPartnerMember_650626ea-2bb6-48ce-b335-d5845de45ccc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_bbb8be49-fa50-4f68-90ed-b39db1ef3a8a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_bbb8be49-fa50-4f68-90ed-b39db1ef3a8a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_bbb8be49-fa50-4f68-90ed-b39db1ef3a8a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_bbb8be49-fa50-4f68-90ed-b39db1ef3a8a" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_bbb8be49-fa50-4f68-90ed-b39db1ef3a8a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_8b038c09-0094-4ca1-b89b-c4cbbcce042c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_bbb8be49-fa50-4f68-90ed-b39db1ef3a8a" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_8b038c09-0094-4ca1-b89b-c4cbbcce042c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_ad65fd6b-d2e9-41a6-9d2c-46d717933d36" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_8b038c09-0094-4ca1-b89b-c4cbbcce042c" xlink:to="loc_paa_SeriesAPreferredUnitsMember_ad65fd6b-d2e9-41a6-9d2c-46d717933d36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesBPreferredUnitsMember_e71c4439-d660-4f44-aacd-51693f701c83" xlink:href="paa-20221231.xsd#paa_SeriesBPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_8b038c09-0094-4ca1-b89b-c4cbbcce042c" xlink:to="loc_paa_SeriesBPreferredUnitsMember_e71c4439-d660-4f44-aacd-51693f701c83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_daeb8d7b-b4f1-4495-bad7-ee17d93d0f24" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_8b038c09-0094-4ca1-b89b-c4cbbcce042c" xlink:to="loc_paa_CommonUnitsMember_daeb8d7b-b4f1-4495-bad7-ee17d93d0f24" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_673e16cf-4dc6-4a58-a84c-60c9de2cd10c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_673e16cf-4dc6-4a58-a84c-60c9de2cd10c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_673e16cf-4dc6-4a58-a84c-60c9de2cd10c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_673e16cf-4dc6-4a58-a84c-60c9de2cd10c" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_673e16cf-4dc6-4a58-a84c-60c9de2cd10c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_aa0b162f-6a0a-4307-8401-19b6abbbab3b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_673e16cf-4dc6-4a58-a84c-60c9de2cd10c" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_aa0b162f-6a0a-4307-8401-19b6abbbab3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_457545a1-4fce-4139-a354-82571b3e6dac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_aa0b162f-6a0a-4307-8401-19b6abbbab3b" xlink:to="loc_us-gaap_ParentMember_457545a1-4fce-4139-a354-82571b3e6dac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_3c3f4ab3-f044-422c-8368-810306258b13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_aa0b162f-6a0a-4307-8401-19b6abbbab3b" xlink:to="loc_us-gaap_NoncontrollingInterestMember_3c3f4ab3-f044-422c-8368-810306258b13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_497a33ba-8e7c-4fc4-9cb5-98d7d031cbac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_497a33ba-8e7c-4fc4-9cb5-98d7d031cbac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_497a33ba-8e7c-4fc4-9cb5-98d7d031cbac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_497a33ba-8e7c-4fc4-9cb5-98d7d031cbac" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_497a33ba-8e7c-4fc4-9cb5-98d7d031cbac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_16132b0e-c4c8-4c51-946b-c4e204b2b5aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_497a33ba-8e7c-4fc4-9cb5-98d7d031cbac" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_16132b0e-c4c8-4c51-946b-c4e204b2b5aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_8077b2eb-ae98-4015-9c5b-1f186c766e4f" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_16132b0e-c4c8-4c51-946b-c4e204b2b5aa" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_8077b2eb-ae98-4015-9c5b-1f186c766e4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_2082ad91-c40f-44dd-8dc7-6424fd7ea1f8" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_16132b0e-c4c8-4c51-946b-c4e204b2b5aa" xlink:to="loc_paa_CactusIIPipelineLLCMember_2082ad91-c40f-44dd-8dc7-6424fd7ea1f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_b2f22c5b-dbfa-4ee7-99f1-89c970269739" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_us-gaap_TransactionTypeAxis_b2f22c5b-dbfa-4ee7-99f1-89c970269739" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_b2f22c5b-dbfa-4ee7-99f1-89c970269739_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_b2f22c5b-dbfa-4ee7-99f1-89c970269739" xlink:to="loc_us-gaap_TransactionDomain_b2f22c5b-dbfa-4ee7-99f1-89c970269739_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_4a77c8b9-4d60-409c-ade9-5fb15e2cde28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_b2f22c5b-dbfa-4ee7-99f1-89c970269739" xlink:to="loc_us-gaap_TransactionDomain_4a77c8b9-4d60-409c-ade9-5fb15e2cde28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_JointVentureFormationMember_e443cd3e-b4ec-492d-a0dd-063fe598b4ac" xlink:href="paa-20221231.xsd#paa_JointVentureFormationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_4a77c8b9-4d60-409c-ade9-5fb15e2cde28" xlink:to="loc_paa_JointVentureFormationMember_e443cd3e-b4ec-492d-a0dd-063fe598b4ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_45a00e1e-0464-4bf4-bfdb-74cfc55eb27a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_srt_CounterpartyNameAxis_45a00e1e-0464-4bf4-bfdb-74cfc55eb27a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_45a00e1e-0464-4bf4-bfdb-74cfc55eb27a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_45a00e1e-0464-4bf4-bfdb-74cfc55eb27a" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_45a00e1e-0464-4bf4-bfdb-74cfc55eb27a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_83347eff-ce25-4b70-93f2-6004d88ec3d3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_45a00e1e-0464-4bf4-bfdb-74cfc55eb27a" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_83347eff-ce25-4b70-93f2-6004d88ec3d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_7340475c-06fd-4598-9bb2-b42875dfcb39" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_83347eff-ce25-4b70-93f2-6004d88ec3d3" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_7340475c-06fd-4598-9bb2-b42875dfcb39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_d6319dae-f91c-4949-8fed-1014f26dd0e2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_srt_OwnershipAxis_d6319dae-f91c-4949-8fed-1014f26dd0e2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_d6319dae-f91c-4949-8fed-1014f26dd0e2_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_d6319dae-f91c-4949-8fed-1014f26dd0e2" xlink:to="loc_srt_OwnershipDomain_d6319dae-f91c-4949-8fed-1014f26dd0e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_adbe1583-93c7-43a9-a364-50fa46b31ac2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_d6319dae-f91c-4949-8fed-1014f26dd0e2" xlink:to="loc_srt_OwnershipDomain_adbe1583-93c7-43a9-a364-50fa46b31ac2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_cbb05d13-e585-4842-b2a1-53cfb87dcfbe" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_adbe1583-93c7-43a9-a364-50fa46b31ac2" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_cbb05d13-e585-4842-b2a1-53cfb87dcfbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_81b5a1e2-3170-4e6d-8ba5-c7b8ff08eb4e" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_dei_LegalEntityAxis_81b5a1e2-3170-4e6d-8ba5-c7b8ff08eb4e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_81b5a1e2-3170-4e6d-8ba5-c7b8ff08eb4e_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_81b5a1e2-3170-4e6d-8ba5-c7b8ff08eb4e" xlink:to="loc_dei_EntityDomain_81b5a1e2-3170-4e6d-8ba5-c7b8ff08eb4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4929bee4-50ec-452c-8430-dfa43ff0e197" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_81b5a1e2-3170-4e6d-8ba5-c7b8ff08eb4e" xlink:to="loc_dei_EntityDomain_4929bee4-50ec-452c-8430-dfa43ff0e197" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_73354b08-0c59-40a2-b5c9-2fefc64738e3" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4929bee4-50ec-452c-8430-dfa43ff0e197" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_73354b08-0c59-40a2-b5c9-2fefc64738e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_d34f995c-3b2f-4c86-a8c7-1475cf68caeb" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_4929bee4-50ec-452c-8430-dfa43ff0e197" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_d34f995c-3b2f-4c86-a8c7-1475cf68caeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_965f7df0-419a-4112-8e3e-0ce14293d4fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01974380-f070-4a25-b0bc-a430ad7f0a64" xlink:to="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_965f7df0-419a-4112-8e3e-0ce14293d4fb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_965f7df0-419a-4112-8e3e-0ce14293d4fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_965f7df0-419a-4112-8e3e-0ce14293d4fb" xlink:to="loc_us-gaap_DistributionTypeDomain_965f7df0-419a-4112-8e3e-0ce14293d4fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_ab192aa9-3025-4497-a1a2-5c62bb1b67f2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_965f7df0-419a-4112-8e3e-0ce14293d4fb" xlink:to="loc_us-gaap_DistributionTypeDomain_ab192aa9-3025-4497-a1a2-5c62bb1b67f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDistributionMember_e1e6a80d-96de-45dc-9a97-46b74c3d75d9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionTypeDomain_ab192aa9-3025-4497-a1a2-5c62bb1b67f2" xlink:to="loc_us-gaap_CashDistributionMember_e1e6a80d-96de-45dc-9a97-46b74c3d75d9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsTables" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsTables"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsTables" xlink:type="extended" id="i9ba7da32d9b34f368d0b8a3f230f9756_PartnersCapitalandDistributionsTables">
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionLineItems_44c38d80-6652-441b-8589-e98b9fbd18b8" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockholdersEquityTableTextBlock_36c55f6a-5738-4d09-9832-e5b979f36439" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfStockholdersEquityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_44c38d80-6652-441b-8589-e98b9fbd18b8" xlink:to="loc_us-gaap_ScheduleOfStockholdersEquityTableTextBlock_36c55f6a-5738-4d09-9832-e5b979f36439" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToLimitedPartnerByDistributionTableTextBlock_d494125d-7db1-4402-98d4-8ca414fd8588" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionsMadeToLimitedPartnerByDistributionTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_44c38d80-6652-441b-8589-e98b9fbd18b8" xlink:to="loc_us-gaap_DistributionsMadeToLimitedPartnerByDistributionTableTextBlock_d494125d-7db1-4402-98d4-8ca414fd8588" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DistributionsMadeToNoncontrollingInterestsTableTextBlock_a805c952-45ae-4871-9993-aed5b80348b1" xlink:href="paa-20221231.xsd#paa_DistributionsMadeToNoncontrollingInterestsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_44c38d80-6652-441b-8589-e98b9fbd18b8" xlink:to="loc_paa_DistributionsMadeToNoncontrollingInterestsTableTextBlock_a805c952-45ae-4871-9993-aed5b80348b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsTable_faf8d756-85f1-4324-8cb5-b946a571ef06" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_44c38d80-6652-441b-8589-e98b9fbd18b8" xlink:to="loc_paa_PartnersCapitalAndDistributionsTable_faf8d756-85f1-4324-8cb5-b946a571ef06" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_d67b71bb-e4f2-4e13-b8d4-66e0f4bad775" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_faf8d756-85f1-4324-8cb5-b946a571ef06" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_d67b71bb-e4f2-4e13-b8d4-66e0f4bad775" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_d67b71bb-e4f2-4e13-b8d4-66e0f4bad775_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_d67b71bb-e4f2-4e13-b8d4-66e0f4bad775" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_d67b71bb-e4f2-4e13-b8d4-66e0f4bad775_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_23995c6f-4ae0-4f40-9bc3-148154853838" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_d67b71bb-e4f2-4e13-b8d4-66e0f4bad775" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_23995c6f-4ae0-4f40-9bc3-148154853838" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_aa1ab084-c780-449e-8246-aa8ad826f617" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_23995c6f-4ae0-4f40-9bc3-148154853838" xlink:to="loc_paa_SeriesAPreferredUnitsMember_aa1ab084-c780-449e-8246-aa8ad826f617" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_60b8ccf6-fbaa-451f-95d8-f1e996e3de83" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_23995c6f-4ae0-4f40-9bc3-148154853838" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_60b8ccf6-fbaa-451f-95d8-f1e996e3de83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_9d76653d-883a-4a56-9a05-5157205d97a6" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_23995c6f-4ae0-4f40-9bc3-148154853838" xlink:to="loc_paa_CommonUnitsMember_9d76653d-883a-4a56-9a05-5157205d97a6" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesTables" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesTables"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesTables" xlink:type="extended" id="i8eab39f7173b46e4a00e48f0bbe7c16d_DerivativesandRiskManagementActivitiesTables">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_5d1c5b29-72fe-4d5f-920d-0d51ff604eb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_5d1c5b29-72fe-4d5f-920d-0d51ff604eb7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_9b53a5d0-9128-4a39-b508-f9a76287a1ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_9b53a5d0-9128-4a39-b508-f9a76287a1ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDueToFromBrokerDealersAndClearingOrganizationsTextBlock_b88d05ac-1396-46d6-844c-773613131e23" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDueToFromBrokerDealersAndClearingOrganizationsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_ScheduleOfDueToFromBrokerDealersAndClearingOrganizationsTextBlock_b88d05ac-1396-46d6-844c-773613131e23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock_925ba88e-92ac-4bbd-8cc0-13b21db73398" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_ScheduleOfDerivativeInstrumentsInStatementOfFinancialPositionFairValueTextBlock_925ba88e-92ac-4bbd-8cc0-13b21db73398" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_9d65c753-6de6-4ee6-8ef5-d782c066ba84" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfDerivativeInstrumentsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_ScheduleOfDerivativeInstrumentsTextBlock_9d65c753-6de6-4ee6-8ef5-d782c066ba84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCashFlowHedgesIncludedInAccumulatedOtherComprehensiveIncomeLossTableTextBlock_e4e2593d-b2f5-44cf-8b54-ac51c5ca26d3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfCashFlowHedgesIncludedInAccumulatedOtherComprehensiveIncomeLossTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_ScheduleOfCashFlowHedgesIncludedInAccumulatedOtherComprehensiveIncomeLossTableTextBlock_e4e2593d-b2f5-44cf-8b54-ac51c5ca26d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_3e53c9ab-e949-4690-ab97-babc5922f5c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_3e53c9ab-e949-4690-ab97-babc5922f5c3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock_94823edb-ff56-457f-81da-a69baf13b8ea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationTableTextBlock_94823edb-ff56-457f-81da-a69baf13b8ea" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_b352d5ea-63f4-44d7-8376-1c196cf0dee4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_0bb12a8a-40dd-4855-a4c3-05ab5668a92b" xlink:to="loc_us-gaap_DerivativeTable_b352d5ea-63f4-44d7-8376-1c196cf0dee4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_08e0acd6-6350-4ee1-8c8c-fc9b32ecb039" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_b352d5ea-63f4-44d7-8376-1c196cf0dee4" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_08e0acd6-6350-4ee1-8c8c-fc9b32ecb039" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_08e0acd6-6350-4ee1-8c8c-fc9b32ecb039_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_08e0acd6-6350-4ee1-8c8c-fc9b32ecb039" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_08e0acd6-6350-4ee1-8c8c-fc9b32ecb039_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_fc7ec666-3c07-4324-b786-1824346ea3d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_08e0acd6-6350-4ee1-8c8c-fc9b32ecb039" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_fc7ec666-3c07-4324-b786-1824346ea3d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_47dc6730-88ec-4e53-b1dc-3e4b9d00b719" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_fc7ec666-3c07-4324-b786-1824346ea3d1" xlink:to="loc_us-gaap_CommodityContractMember_47dc6730-88ec-4e53-b1dc-3e4b9d00b719" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_dababeb7-49ee-4094-bbac-5b01f8321149" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_fc7ec666-3c07-4324-b786-1824346ea3d1" xlink:to="loc_us-gaap_InterestRateContractMember_dababeb7-49ee-4094-bbac-5b01f8321149" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/OrganizationandBasisofConsolidationandPresentationDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#OrganizationandBasisofConsolidationandPresentationDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/OrganizationandBasisofConsolidationandPresentationDetails" xlink:type="extended" id="ia48a72996fe44acd80082c932489062c_OrganizationandBasisofConsolidationandPresentationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_OrganizationAndBasisOfPresentationLineItems_c7bd69ec-38f3-4bd3-a311-d1a5407dae5d" xlink:href="paa-20221231.xsd#paa_OrganizationAndBasisOfPresentationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfOperatingSegments_d3e9899a-ebd9-4af8-b8da-6beaa155561f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfOperatingSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_OrganizationAndBasisOfPresentationLineItems_c7bd69ec-38f3-4bd3-a311-d1a5407dae5d" xlink:to="loc_us-gaap_NumberOfOperatingSegments_d3e9899a-ebd9-4af8-b8da-6beaa155561f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits_ea8cf8d7-7250-491d-815f-55c16df43013" xlink:href="paa-20221231.xsd#paa_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_OrganizationAndBasisOfPresentationLineItems_c7bd69ec-38f3-4bd3-a311-d1a5407dae5d" xlink:to="loc_paa_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits_ea8cf8d7-7250-491d-815f-55c16df43013" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_b83978b6-aa27-4525-ba86-b2654e51250a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_OrganizationAndBasisOfPresentationLineItems_c7bd69ec-38f3-4bd3-a311-d1a5407dae5d" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_b83978b6-aa27-4525-ba86-b2654e51250a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_888df2c7-4b48-42a7-8f65-2ab6d7fdd427" xlink:href="paa-20221231.xsd#paa_OrganizationConsolidationAndPresentationOfFinancialStatementsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_OrganizationAndBasisOfPresentationLineItems_c7bd69ec-38f3-4bd3-a311-d1a5407dae5d" xlink:to="loc_paa_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_888df2c7-4b48-42a7-8f65-2ab6d7fdd427" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_8a1c4b4b-9987-4ad4-be48-7e58e262070d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_888df2c7-4b48-42a7-8f65-2ab6d7fdd427" xlink:to="loc_srt_OwnershipAxis_8a1c4b4b-9987-4ad4-be48-7e58e262070d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_8a1c4b4b-9987-4ad4-be48-7e58e262070d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_8a1c4b4b-9987-4ad4-be48-7e58e262070d" xlink:to="loc_srt_OwnershipDomain_8a1c4b4b-9987-4ad4-be48-7e58e262070d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_232d11dc-b62b-4f1e-b003-2f9593ecce6c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_8a1c4b4b-9987-4ad4-be48-7e58e262070d" xlink:to="loc_srt_OwnershipDomain_232d11dc-b62b-4f1e-b003-2f9593ecce6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAAPLPMember_ab13fd5f-a515-4ab4-ae98-0b308d1a21c9" xlink:href="paa-20221231.xsd#paa_PlainsAAPLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_232d11dc-b62b-4f1e-b003-2f9593ecce6c" xlink:to="loc_paa_PlainsAAPLPMember_ab13fd5f-a515-4ab4-ae98-0b308d1a21c9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAllAmericanPipelineLPMember_ee0631ea-742d-4936-adb7-16c8119863fb" xlink:href="paa-20221231.xsd#paa_PlainsAllAmericanPipelineLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_232d11dc-b62b-4f1e-b003-2f9593ecce6c" xlink:to="loc_paa_PlainsAllAmericanPipelineLPMember_ee0631ea-742d-4936-adb7-16c8119863fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_be626dc4-a629-4a98-bb2f-d5d1d0f843ed" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_OrganizationConsolidationAndPresentationOfFinancialStatementsTable_888df2c7-4b48-42a7-8f65-2ab6d7fdd427" xlink:to="loc_dei_LegalEntityAxis_be626dc4-a629-4a98-bb2f-d5d1d0f843ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_be626dc4-a629-4a98-bb2f-d5d1d0f843ed_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_be626dc4-a629-4a98-bb2f-d5d1d0f843ed" xlink:to="loc_dei_EntityDomain_be626dc4-a629-4a98-bb2f-d5d1d0f843ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ea1780c9-f78d-475c-80e5-bcf80fc99450" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_be626dc4-a629-4a98-bb2f-d5d1d0f843ed" xlink:to="loc_dei_EntityDomain_ea1780c9-f78d-475c-80e5-bcf80fc99450" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAAPLPMember_62b6adbf-cdfd-4057-8cfb-3946f8eb1845" xlink:href="paa-20221231.xsd#paa_PlainsAAPLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_ea1780c9-f78d-475c-80e5-bcf80fc99450" xlink:to="loc_paa_PlainsAAPLPMember_62b6adbf-cdfd-4057-8cfb-3946f8eb1845" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsGPHoldingsLPMember_bd1745d4-6ec3-44b7-b8e6-0dffd05140e9" xlink:href="paa-20221231.xsd#paa_PlainsGPHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_ea1780c9-f78d-475c-80e5-bcf80fc99450" xlink:to="loc_paa_PlainsGPHoldingsLPMember_bd1745d4-6ec3-44b7-b8e6-0dffd05140e9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RevenuesandAccountsReceivableDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#RevenuesandAccountsReceivableDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/RevenuesandAccountsReceivableDisaggregationofRevenueDetails" xlink:type="extended" id="i9ac10b173450492dba4144edacbf6de1_RevenuesandAccountsReceivableDisaggregationofRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_ceb93f83-408d-4be8-a409-6a60c4d913b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b357e050-f0a0-4f7f-a613-e0020c98ec96" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_ceb93f83-408d-4be8-a409-6a60c4d913b8" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_b357e050-f0a0-4f7f-a613-e0020c98ec96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_43302095-eaba-44d1-acec-889981b14f38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_ceb93f83-408d-4be8-a409-6a60c4d913b8" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_43302095-eaba-44d1-acec-889981b14f38" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_02d00933-4984-4652-b235-2581c9cf2932" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_43302095-eaba-44d1-acec-889981b14f38" xlink:to="loc_srt_ConsolidationItemsAxis_02d00933-4984-4652-b235-2581c9cf2932" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_02d00933-4984-4652-b235-2581c9cf2932_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_02d00933-4984-4652-b235-2581c9cf2932" xlink:to="loc_srt_ConsolidationItemsDomain_02d00933-4984-4652-b235-2581c9cf2932_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_9c4e2188-0caf-474a-8035-6ee8bf339560" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_02d00933-4984-4652-b235-2581c9cf2932" xlink:to="loc_srt_ConsolidationItemsDomain_9c4e2188-0caf-474a-8035-6ee8bf339560" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_0dcfde0f-8ddf-478f-a36c-615ebaa94a98" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_9c4e2188-0caf-474a-8035-6ee8bf339560" xlink:to="loc_us-gaap_OperatingSegmentsMember_0dcfde0f-8ddf-478f-a36c-615ebaa94a98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_879ef70a-d7cd-437c-91ea-c4a2ac20c566" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_43302095-eaba-44d1-acec-889981b14f38" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_879ef70a-d7cd-437c-91ea-c4a2ac20c566" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_879ef70a-d7cd-437c-91ea-c4a2ac20c566_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_879ef70a-d7cd-437c-91ea-c4a2ac20c566" xlink:to="loc_us-gaap_SegmentDomain_879ef70a-d7cd-437c-91ea-c4a2ac20c566_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ebec5772-18c4-44ba-9439-a693b027aa71" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_879ef70a-d7cd-437c-91ea-c4a2ac20c566" xlink:to="loc_us-gaap_SegmentDomain_ebec5772-18c4-44ba-9439-a693b027aa71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilSegmentMember_7ea3aa19-3e68-49dd-85c3-3d581a3d91a3" xlink:href="paa-20221231.xsd#paa_CrudeOilSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ebec5772-18c4-44ba-9439-a693b027aa71" xlink:to="loc_paa_CrudeOilSegmentMember_7ea3aa19-3e68-49dd-85c3-3d581a3d91a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NaturalGasLiquidsSegmentMember_d79c981c-12d5-4138-90da-95257b6cc7f1" xlink:href="paa-20221231.xsd#paa_NaturalGasLiquidsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_ebec5772-18c4-44ba-9439-a693b027aa71" xlink:to="loc_paa_NaturalGasLiquidsSegmentMember_d79c981c-12d5-4138-90da-95257b6cc7f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_190a734b-9a6d-4943-a078-8a3528ba4068" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_43302095-eaba-44d1-acec-889981b14f38" xlink:to="loc_srt_ProductOrServiceAxis_190a734b-9a6d-4943-a078-8a3528ba4068" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_190a734b-9a6d-4943-a078-8a3528ba4068_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_190a734b-9a6d-4943-a078-8a3528ba4068" xlink:to="loc_srt_ProductsAndServicesDomain_190a734b-9a6d-4943-a078-8a3528ba4068_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d8e45af9-658f-4604-96c0-fd5591e1e9fd" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_190a734b-9a6d-4943-a078-8a3528ba4068" xlink:to="loc_srt_ProductsAndServicesDomain_d8e45af9-658f-4604-96c0-fd5591e1e9fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_50e494e4-4a20-46e8-af60-537c9d679ed0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d8e45af9-658f-4604-96c0-fd5591e1e9fd" xlink:to="loc_us-gaap_ProductMember_50e494e4-4a20-46e8-af60-537c9d679ed0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_TransportationMember_ab677b20-5de9-4f24-b4c0-0e2b182e3be0" xlink:href="paa-20221231.xsd#paa_TransportationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d8e45af9-658f-4604-96c0-fd5591e1e9fd" xlink:to="loc_paa_TransportationMember_ab677b20-5de9-4f24-b4c0-0e2b182e3be0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_TerminallingStorageAndOtherMember_d727da7e-6bfe-42c6-86c0-a15cc648f2b0" xlink:href="paa-20221231.xsd#paa_TerminallingStorageAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_d8e45af9-658f-4604-96c0-fd5591e1e9fd" xlink:to="loc_paa_TerminallingStorageAndOtherMember_d727da7e-6bfe-42c6-86c0-a15cc648f2b0" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RevenuesandAccountsReceivableSegmentRevenueDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#RevenuesandAccountsReceivableSegmentRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/RevenuesandAccountsReceivableSegmentRevenueDetails" xlink:type="extended" id="iaa10eee396914aa5a515bf986a09eea2_RevenuesandAccountsReceivableSegmentRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_fbf101ad-fca0-423f-9906-c7f953482eaf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_862b9b67-293f-4dd8-b517-295a105c3585" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fbf101ad-fca0-423f-9906-c7f953482eaf" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_862b9b67-293f-4dd8-b517-295a105c3585" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueNotFromContractWithCustomer_a6d3ecea-b816-4a4e-91f0-a250f4392043" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueNotFromContractWithCustomer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fbf101ad-fca0-423f-9906-c7f953482eaf" xlink:to="loc_us-gaap_RevenueNotFromContractWithCustomer_a6d3ecea-b816-4a4e-91f0-a250f4392043" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_4f99c5e5-5062-42c2-866c-4a23ad022373" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fbf101ad-fca0-423f-9906-c7f953482eaf" xlink:to="loc_us-gaap_Revenues_4f99c5e5-5062-42c2-866c-4a23ad022373" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_d0178bda-e818-41cf-8aa6-83ffece5e1ac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_fbf101ad-fca0-423f-9906-c7f953482eaf" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_d0178bda-e818-41cf-8aa6-83ffece5e1ac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_ac8ff4de-0b0e-4f7b-84f0-c242daa4820d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_d0178bda-e818-41cf-8aa6-83ffece5e1ac" xlink:to="loc_srt_ConsolidationItemsAxis_ac8ff4de-0b0e-4f7b-84f0-c242daa4820d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_ac8ff4de-0b0e-4f7b-84f0-c242daa4820d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_ac8ff4de-0b0e-4f7b-84f0-c242daa4820d" xlink:to="loc_srt_ConsolidationItemsDomain_ac8ff4de-0b0e-4f7b-84f0-c242daa4820d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_a526ad5a-dcd9-40a5-85f9-aa68dd6e66db" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_ac8ff4de-0b0e-4f7b-84f0-c242daa4820d" xlink:to="loc_srt_ConsolidationItemsDomain_a526ad5a-dcd9-40a5-85f9-aa68dd6e66db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_7edc0c0c-d29a-49f6-b143-4ba4c42f7753" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a526ad5a-dcd9-40a5-85f9-aa68dd6e66db" xlink:to="loc_us-gaap_OperatingSegmentsMember_7edc0c0c-d29a-49f6-b143-4ba4c42f7753" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_9050297b-1262-4bde-9ee1-a19986ff05e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_a526ad5a-dcd9-40a5-85f9-aa68dd6e66db" xlink:to="loc_us-gaap_IntersegmentEliminationMember_9050297b-1262-4bde-9ee1-a19986ff05e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ea5b554e-5ad6-494f-8ef8-deadeedd6ae7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_d0178bda-e818-41cf-8aa6-83ffece5e1ac" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ea5b554e-5ad6-494f-8ef8-deadeedd6ae7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_ea5b554e-5ad6-494f-8ef8-deadeedd6ae7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ea5b554e-5ad6-494f-8ef8-deadeedd6ae7" xlink:to="loc_us-gaap_SegmentDomain_ea5b554e-5ad6-494f-8ef8-deadeedd6ae7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f2576faf-5419-4041-ba5d-fa7ac229bc15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ea5b554e-5ad6-494f-8ef8-deadeedd6ae7" xlink:to="loc_us-gaap_SegmentDomain_f2576faf-5419-4041-ba5d-fa7ac229bc15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilSegmentMember_980032de-aa41-4998-9e7a-18c87c1469d5" xlink:href="paa-20221231.xsd#paa_CrudeOilSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_f2576faf-5419-4041-ba5d-fa7ac229bc15" xlink:to="loc_paa_CrudeOilSegmentMember_980032de-aa41-4998-9e7a-18c87c1469d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NaturalGasLiquidsSegmentMember_ba94de9d-fcae-4167-81f6-543956ae464a" xlink:href="paa-20221231.xsd#paa_NaturalGasLiquidsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_f2576faf-5419-4041-ba5d-fa7ac229bc15" xlink:to="loc_paa_NaturalGasLiquidsSegmentMember_ba94de9d-fcae-4167-81f6-543956ae464a" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RevenuesandAccountsReceivableCounterpartyDeficienciesDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#RevenuesandAccountsReceivableCounterpartyDeficienciesDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/RevenuesandAccountsReceivableCounterpartyDeficienciesDetails" xlink:type="extended" id="ie87547ec2d2a4a429f89338860930fef_RevenuesandAccountsReceivableCounterpartyDeficienciesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_6c03cfbe-7b01-43dd-8944-78d9e12fc737" xlink:href="paa-20221231.xsd#paa_ContractWithCustomerAssetAndLiabilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_407a6990-fd00-4191-8104-9677d7a754f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_6c03cfbe-7b01-43dd-8944-78d9e12fc737" xlink:to="loc_us-gaap_ContractWithCustomerLiability_407a6990-fd00-4191-8104-9677d7a754f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CounterpartyDeficienciesUnbilledAndUncollected_dd5e9542-397c-405f-aa72-ad087bce7cfb" xlink:href="paa-20221231.xsd#paa_CounterpartyDeficienciesUnbilledAndUncollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_6c03cfbe-7b01-43dd-8944-78d9e12fc737" xlink:to="loc_paa_CounterpartyDeficienciesUnbilledAndUncollected_dd5e9542-397c-405f-aa72-ad087bce7cfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CounterpartyDeficiencies_786d08e4-03bd-4efa-b6eb-ba2d0ba030db" xlink:href="paa-20221231.xsd#paa_CounterpartyDeficiencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_6c03cfbe-7b01-43dd-8944-78d9e12fc737" xlink:to="loc_paa_CounterpartyDeficiencies_786d08e4-03bd-4efa-b6eb-ba2d0ba030db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ContractWithCustomerAssetAndLiabilityTable_3edfd365-c705-418a-998d-1a98c72e0df0" xlink:href="paa-20221231.xsd#paa_ContractWithCustomerAssetAndLiabilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_6c03cfbe-7b01-43dd-8944-78d9e12fc737" xlink:to="loc_paa_ContractWithCustomerAssetAndLiabilityTable_3edfd365-c705-418a-998d-1a98c72e0df0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfArrangementAxis_134f7ce7-16b9-4d7d-980d-f0bfe4c4bb5f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TypeOfArrangementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityTable_3edfd365-c705-418a-998d-1a98c72e0df0" xlink:to="loc_us-gaap_TypeOfArrangementAxis_134f7ce7-16b9-4d7d-980d-f0bfe4c4bb5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_134f7ce7-16b9-4d7d-980d-f0bfe4c4bb5f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TypeOfArrangementAxis_134f7ce7-16b9-4d7d-980d-f0bfe4c4bb5f" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_134f7ce7-16b9-4d7d-980d-f0bfe4c4bb5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_c9ac1a62-ac52-48fd-bb05-c5b0696156f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TypeOfArrangementAxis_134f7ce7-16b9-4d7d-980d-f0bfe4c4bb5f" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_c9ac1a62-ac52-48fd-bb05-c5b0696156f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_MinimumVolumeCommitmentAgreementsMember_4ef0977f-a0c4-4862-874a-588cdb270d0a" xlink:href="paa-20221231.xsd#paa_MinimumVolumeCommitmentAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_c9ac1a62-ac52-48fd-bb05-c5b0696156f0" xlink:to="loc_paa_MinimumVolumeCommitmentAgreementsMember_4ef0977f-a0c4-4862-874a-588cdb270d0a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RevenuesandAccountsReceivableContractBalancesDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#RevenuesandAccountsReceivableContractBalancesDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/RevenuesandAccountsReceivableContractBalancesDetails" xlink:type="extended" id="idc1cedb39bfb4566b0dbf1b4963d3163_RevenuesandAccountsReceivableContractBalancesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_3aaf6510-75cf-4ec4-a49b-bf63595adc62" xlink:href="paa-20221231.xsd#paa_ContractWithCustomerAssetAndLiabilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ChangeInContractWithCustomerLiabilityRollForward_4e47ce45-eee1-422e-8ca4-b487fceaa2de" xlink:href="paa-20221231.xsd#paa_ChangeInContractWithCustomerLiabilityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_3aaf6510-75cf-4ec4-a49b-bf63595adc62" xlink:to="loc_paa_ChangeInContractWithCustomerLiabilityRollForward_4e47ce45-eee1-422e-8ca4-b487fceaa2de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_d76386cd-eb43-4e37-94ca-26d4e6e4c11d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ChangeInContractWithCustomerLiabilityRollForward_4e47ce45-eee1-422e-8ca4-b487fceaa2de" xlink:to="loc_us-gaap_ContractWithCustomerLiability_d76386cd-eb43-4e37-94ca-26d4e6e4c11d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_64140835-5205-4d58-95ec-ec7facfdedd6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ChangeInContractWithCustomerLiabilityRollForward_4e47ce45-eee1-422e-8ca4-b487fceaa2de" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_64140835-5205-4d58-95ec-ec7facfdedd6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ContractwithCustomerLiabilityAdditions_658ec70b-10fa-4812-8a5d-2e0dde2ee387" xlink:href="paa-20221231.xsd#paa_ContractwithCustomerLiabilityAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ChangeInContractWithCustomerLiabilityRollForward_4e47ce45-eee1-422e-8ca4-b487fceaa2de" xlink:to="loc_paa_ContractwithCustomerLiabilityAdditions_658ec70b-10fa-4812-8a5d-2e0dde2ee387" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ContractwithCustomerLiabilityOther_b266d3cc-1f4c-4651-a40b-b21f74ff7430" xlink:href="paa-20221231.xsd#paa_ContractwithCustomerLiabilityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ChangeInContractWithCustomerLiabilityRollForward_4e47ce45-eee1-422e-8ca4-b487fceaa2de" xlink:to="loc_paa_ContractwithCustomerLiabilityOther_b266d3cc-1f4c-4651-a40b-b21f74ff7430" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_7cda7b5a-c88c-4fe1-954d-d76d29515a50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ContractWithCustomerLiabilityRevenueRecognitionTerm_997fba39-865f-45bd-bf3e-aeeb6be10961" xlink:href="paa-20221231.xsd#paa_ContractWithCustomerLiabilityRevenueRecognitionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_3aaf6510-75cf-4ec4-a49b-bf63595adc62" xlink:to="loc_paa_ContractWithCustomerLiabilityRevenueRecognitionTerm_997fba39-865f-45bd-bf3e-aeeb6be10961" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ContractWithCustomerAssetAndLiabilityTable_03f6932a-f314-47e0-8cdc-8cec4f886576" xlink:href="paa-20221231.xsd#paa_ContractWithCustomerAssetAndLiabilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityLineItems_3aaf6510-75cf-4ec4-a49b-bf63595adc62" xlink:to="loc_paa_ContractWithCustomerAssetAndLiabilityTable_03f6932a-f314-47e0-8cdc-8cec4f886576" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfArrangementAxis_cbbcd546-e036-4c62-b439-6bb2f32648c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TypeOfArrangementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_ContractWithCustomerAssetAndLiabilityTable_03f6932a-f314-47e0-8cdc-8cec4f886576" xlink:to="loc_us-gaap_TypeOfArrangementAxis_cbbcd546-e036-4c62-b439-6bb2f32648c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_cbbcd546-e036-4c62-b439-6bb2f32648c3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TypeOfArrangementAxis_cbbcd546-e036-4c62-b439-6bb2f32648c3" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_cbbcd546-e036-4c62-b439-6bb2f32648c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_ac291604-8c25-4717-9050-f22eb5f2e252" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ArrangementsAndNonarrangementTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TypeOfArrangementAxis_cbbcd546-e036-4c62-b439-6bb2f32648c3" xlink:to="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_ac291604-8c25-4717-9050-f22eb5f2e252" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilSalesAgreementsEnteredIntoInConjunctionWIthStorageArrangementsAndFutureInventoryExchangesMember_fd6a672a-0034-45cb-b94b-4c3af0060453" xlink:href="paa-20221231.xsd#paa_CrudeOilSalesAgreementsEnteredIntoInConjunctionWIthStorageArrangementsAndFutureInventoryExchangesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_ac291604-8c25-4717-9050-f22eb5f2e252" xlink:to="loc_paa_CrudeOilSalesAgreementsEnteredIntoInConjunctionWIthStorageArrangementsAndFutureInventoryExchangesMember_fd6a672a-0034-45cb-b94b-4c3af0060453" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GasProcessingAgreementThatWasEnteredIntoInConjunctionWithThePurchaseOfAnAdditionalOwnershipInterestInCertainStraddlePlantsMember_7dd35b49-f4aa-4c7f-a41f-599f2fc5564d" xlink:href="paa-20221231.xsd#paa_GasProcessingAgreementThatWasEnteredIntoInConjunctionWithThePurchaseOfAnAdditionalOwnershipInterestInCertainStraddlePlantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ArrangementsAndNonarrangementTransactionsMember_ac291604-8c25-4717-9050-f22eb5f2e252" xlink:to="loc_paa_GasProcessingAgreementThatWasEnteredIntoInConjunctionWithThePurchaseOfAnAdditionalOwnershipInterestInCertainStraddlePlantsMember_7dd35b49-f4aa-4c7f-a41f-599f2fc5564d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RevenuesandAccountsReceivablePerformanceObligationsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#RevenuesandAccountsReceivablePerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/RevenuesandAccountsReceivablePerformanceObligationsDetails" xlink:type="extended" id="i84486d0e449a412fb8550a3c030d26b7_RevenuesandAccountsReceivablePerformanceObligationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_49dd5685-c34a-48f4-93bf-ec4d274cbb05" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_ecdc3fce-e30b-4a00-bc71-98c834214748" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_49dd5685-c34a-48f4-93bf-ec4d274cbb05" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_ecdc3fce-e30b-4a00-bc71-98c834214748" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8f33646e-d060-402b-8e3b-28c8ab121add" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_49dd5685-c34a-48f4-93bf-ec4d274cbb05" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8f33646e-d060-402b-8e3b-28c8ab121add" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_730e73e4-c024-4e60-bae3-a145b2f37b71" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_49dd5685-c34a-48f4-93bf-ec4d274cbb05" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_730e73e4-c024-4e60-bae3-a145b2f37b71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_954a4d1f-4e37-490b-84fc-38647f951f3a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_730e73e4-c024-4e60-bae3-a145b2f37b71" xlink:to="loc_srt_ProductOrServiceAxis_954a4d1f-4e37-490b-84fc-38647f951f3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_954a4d1f-4e37-490b-84fc-38647f951f3a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_954a4d1f-4e37-490b-84fc-38647f951f3a" xlink:to="loc_srt_ProductsAndServicesDomain_954a4d1f-4e37-490b-84fc-38647f951f3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7d644e71-766b-4245-ada8-4f4ce3d0147b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_954a4d1f-4e37-490b-84fc-38647f951f3a" xlink:to="loc_srt_ProductsAndServicesDomain_7d644e71-766b-4245-ada8-4f4ce3d0147b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PipelineRevenuesSupportedByMinimumVolumeCommitmentsAndLongTermCapacityAgreementsMember_3cb0590d-8173-4d54-b6fe-11752c7a5a77" xlink:href="paa-20221231.xsd#paa_PipelineRevenuesSupportedByMinimumVolumeCommitmentsAndLongTermCapacityAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7d644e71-766b-4245-ada8-4f4ce3d0147b" xlink:to="loc_paa_PipelineRevenuesSupportedByMinimumVolumeCommitmentsAndLongTermCapacityAgreementsMember_3cb0590d-8173-4d54-b6fe-11752c7a5a77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_TerminallingLongTermStorageAndThroughputAgreementsRevenuesMember_27fa824e-736a-4854-a7f1-b3cf7479c76e" xlink:href="paa-20221231.xsd#paa_TerminallingLongTermStorageAndThroughputAgreementsRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7d644e71-766b-4245-ada8-4f4ce3d0147b" xlink:to="loc_paa_TerminallingLongTermStorageAndThroughputAgreementsRevenuesMember_27fa824e-736a-4854-a7f1-b3cf7479c76e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_e8398513-b879-4937-9586-9a5e208921ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_730e73e4-c024-4e60-bae3-a145b2f37b71" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_e8398513-b879-4937-9586-9a5e208921ee" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RevenuesandAccountsReceivablePerformanceObligationsDetails_1" xlink:type="simple" xlink:href="paa-20221231.xsd#RevenuesandAccountsReceivablePerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/RevenuesandAccountsReceivablePerformanceObligationsDetails_1" xlink:type="extended" id="i4cef3c803c1643e9a0cc3ecf72b8c2ee_RevenuesandAccountsReceivablePerformanceObligationsDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_49dd5685-c34a-48f4-93bf-ec4d274cbb05" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_ecdc3fce-e30b-4a00-bc71-98c834214748" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_49dd5685-c34a-48f4-93bf-ec4d274cbb05" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_ecdc3fce-e30b-4a00-bc71-98c834214748" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8f33646e-d060-402b-8e3b-28c8ab121add" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_49dd5685-c34a-48f4-93bf-ec4d274cbb05" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_8f33646e-d060-402b-8e3b-28c8ab121add" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_730e73e4-c024-4e60-bae3-a145b2f37b71" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_49dd5685-c34a-48f4-93bf-ec4d274cbb05" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_730e73e4-c024-4e60-bae3-a145b2f37b71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_954a4d1f-4e37-490b-84fc-38647f951f3a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_730e73e4-c024-4e60-bae3-a145b2f37b71" xlink:to="loc_srt_ProductOrServiceAxis_954a4d1f-4e37-490b-84fc-38647f951f3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_954a4d1f-4e37-490b-84fc-38647f951f3a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_954a4d1f-4e37-490b-84fc-38647f951f3a" xlink:to="loc_srt_ProductsAndServicesDomain_954a4d1f-4e37-490b-84fc-38647f951f3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_7d644e71-766b-4245-ada8-4f4ce3d0147b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_954a4d1f-4e37-490b-84fc-38647f951f3a" xlink:to="loc_srt_ProductsAndServicesDomain_7d644e71-766b-4245-ada8-4f4ce3d0147b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PipelineRevenuesSupportedByMinimumVolumeCommitmentsAndLongTermCapacityAgreementsMember_3cb0590d-8173-4d54-b6fe-11752c7a5a77" xlink:href="paa-20221231.xsd#paa_PipelineRevenuesSupportedByMinimumVolumeCommitmentsAndLongTermCapacityAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7d644e71-766b-4245-ada8-4f4ce3d0147b" xlink:to="loc_paa_PipelineRevenuesSupportedByMinimumVolumeCommitmentsAndLongTermCapacityAgreementsMember_3cb0590d-8173-4d54-b6fe-11752c7a5a77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_TerminallingLongTermStorageAndThroughputAgreementsRevenuesMember_27fa824e-736a-4854-a7f1-b3cf7479c76e" xlink:href="paa-20221231.xsd#paa_TerminallingLongTermStorageAndThroughputAgreementsRevenuesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_7d644e71-766b-4245-ada8-4f4ce3d0147b" xlink:to="loc_paa_TerminallingLongTermStorageAndThroughputAgreementsRevenuesMember_27fa824e-736a-4854-a7f1-b3cf7479c76e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/NetIncomeLossPerCommonUnitDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#NetIncomeLossPerCommonUnitDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/NetIncomeLossPerCommonUnitDetails" xlink:type="extended" id="i9e80fd74995248eda8e62afb0156c1dd_NetIncomeLossPerCommonUnitDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_BasicAndDilutedNetIncomePerCommonUnitLineItems_ae6dc278-cd6a-4e8b-8fad-b5bc1a00aec0" xlink:href="paa-20221231.xsd#paa_BasicAndDilutedNetIncomePerCommonUnitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c95962a9-b7d1-409d-8fca-4a9df2b85e7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_BasicAndDilutedNetIncomePerCommonUnitLineItems_ae6dc278-cd6a-4e8b-8fad-b5bc1a00aec0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c95962a9-b7d1-409d-8fca-4a9df2b85e7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumerDilutedLimitedPartnershipUnitsOutstandingAdjustment_044c51c4-8d57-4445-a135-a556eda7ca03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageNumerDilutedLimitedPartnershipUnitsOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_BasicAndDilutedNetIncomePerCommonUnitLineItems_ae6dc278-cd6a-4e8b-8fad-b5bc1a00aec0" xlink:to="loc_us-gaap_WeightedAverageNumerDilutedLimitedPartnershipUnitsOutstandingAdjustment_044c51c4-8d57-4445-a135-a556eda7ca03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EarningsPerLimitedPartnershipUnitAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_BasicAndDilutedNetIncomePerCommonUnitLineItems_ae6dc278-cd6a-4e8b-8fad-b5bc1a00aec0" xlink:to="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4b6b5ee9-921d-49b8-9f10-4ae848c16d52" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_us-gaap_NetIncomeLoss_4b6b5ee9-921d-49b8-9f10-4ae848c16d52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_a1440313-9dd7-4446-a5fd-8b6faf75dc15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_a1440313-9dd7-4446-a5fd-8b6faf75dc15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic_270632dd-bb7e-4a33-ba9b-a71d7503ba7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic_270632dd-bb7e-4a33-ba9b-a71d7503ba7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NetIncomeLossAllocatedToCommonUnitholdersBasic_d7ed7b8f-3bc2-4e2d-8983-d22dbd307bd9" xlink:href="paa-20221231.xsd#paa_NetIncomeLossAllocatedToCommonUnitholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_paa_NetIncomeLossAllocatedToCommonUnitholdersBasic_d7ed7b8f-3bc2-4e2d-8983-d22dbd307bd9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NetIncomeLossAllocatedToCommonUnitholdersDiluted_47ad731c-9d70-49d0-b437-10988c573414" xlink:href="paa-20221231.xsd#paa_NetIncomeLossAllocatedToCommonUnitholdersDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_paa_NetIncomeLossAllocatedToCommonUnitholdersDiluted_47ad731c-9d70-49d0-b437-10988c573414" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding_9ae7835e-c761-4921-815d-8c361c67521b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding_9ae7835e-c761-4921-815d-8c361c67521b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted_116100d3-f755-4cf9-ab27-73fa16ffd5bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted_116100d3-f755-4cf9-ab27-73fa16ffd5bd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax_8e1f36f4-142c-44b7-9166-fa36667d2932" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax_8e1f36f4-142c-44b7-9166-fa36667d2932" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted_5f6a20f4-9564-4453-a0b4-8330889ff05b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerLimitedPartnershipUnitAbstract_5bdc853a-f645-4300-b682-18423932a448" xlink:to="loc_us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted_5f6a20f4-9564-4453-a0b4-8330889ff05b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ScheduleOfCalculationOfBasicAndDilutedNetIncomePerCommonUnitTable_696c05e2-87e9-4679-a60f-eb77f06c0374" xlink:href="paa-20221231.xsd#paa_ScheduleOfCalculationOfBasicAndDilutedNetIncomePerCommonUnitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_BasicAndDilutedNetIncomePerCommonUnitLineItems_ae6dc278-cd6a-4e8b-8fad-b5bc1a00aec0" xlink:to="loc_paa_ScheduleOfCalculationOfBasicAndDilutedNetIncomePerCommonUnitTable_696c05e2-87e9-4679-a60f-eb77f06c0374" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_7b6a4ac4-d1f4-4ffd-aa3b-060af0d7ea1a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_ScheduleOfCalculationOfBasicAndDilutedNetIncomePerCommonUnitTable_696c05e2-87e9-4679-a60f-eb77f06c0374" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_7b6a4ac4-d1f4-4ffd-aa3b-060af0d7ea1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_7b6a4ac4-d1f4-4ffd-aa3b-060af0d7ea1a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_7b6a4ac4-d1f4-4ffd-aa3b-060af0d7ea1a" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_7b6a4ac4-d1f4-4ffd-aa3b-060af0d7ea1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_ff9dac23-7789-4487-be9f-b7374d3a4d83" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_7b6a4ac4-d1f4-4ffd-aa3b-060af0d7ea1a" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_ff9dac23-7789-4487-be9f-b7374d3a4d83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_9e27e77d-4d7f-4810-80b9-35d32cfb6353" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_ff9dac23-7789-4487-be9f-b7374d3a4d83" xlink:to="loc_paa_SeriesAPreferredUnitsMember_9e27e77d-4d7f-4810-80b9-35d32cfb6353" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesBPreferredUnitsMember_a45243a7-c20b-4e47-a757-9b9204979faa" xlink:href="paa-20221231.xsd#paa_SeriesBPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_ff9dac23-7789-4487-be9f-b7374d3a4d83" xlink:to="loc_paa_SeriesBPreferredUnitsMember_a45243a7-c20b-4e47-a757-9b9204979faa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_4ea388be-929f-424f-bbff-a06f4aa49a91" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_ff9dac23-7789-4487-be9f-b7374d3a4d83" xlink:to="loc_paa_CommonUnitsMember_4ea388be-929f-424f-bbff-a06f4aa49a91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d2899da3-e295-48c8-b0bf-bd656e4a253a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_ScheduleOfCalculationOfBasicAndDilutedNetIncomePerCommonUnitTable_696c05e2-87e9-4679-a60f-eb77f06c0374" xlink:to="loc_srt_RangeAxis_d2899da3-e295-48c8-b0bf-bd656e4a253a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d2899da3-e295-48c8-b0bf-bd656e4a253a_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d2899da3-e295-48c8-b0bf-bd656e4a253a" xlink:to="loc_srt_RangeMember_d2899da3-e295-48c8-b0bf-bd656e4a253a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_60d05efc-befd-4cc9-9f1d-3acd4e7ff6e4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d2899da3-e295-48c8-b0bf-bd656e4a253a" xlink:to="loc_srt_RangeMember_60d05efc-befd-4cc9-9f1d-3acd4e7ff6e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_1deea3a5-9817-43f5-ae3d-129336ee5828" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_60d05efc-befd-4cc9-9f1d-3acd4e7ff6e4" xlink:to="loc_srt_WeightedAverageMember_1deea3a5-9817-43f5-ae3d-129336ee5828" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_502208b2-44b2-45bc-856d-58ea78fd9650" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_ScheduleOfCalculationOfBasicAndDilutedNetIncomePerCommonUnitTable_696c05e2-87e9-4679-a60f-eb77f06c0374" xlink:to="loc_us-gaap_AwardTypeAxis_502208b2-44b2-45bc-856d-58ea78fd9650" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_502208b2-44b2-45bc-856d-58ea78fd9650_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_502208b2-44b2-45bc-856d-58ea78fd9650" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_502208b2-44b2-45bc-856d-58ea78fd9650_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53e93ab9-f664-42dd-8eb0-bf46dafcf35e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_502208b2-44b2-45bc-856d-58ea78fd9650" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53e93ab9-f664-42dd-8eb0-bf46dafcf35e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityIndexedCompensationPlanAwardMember_9fc94f0a-c199-4bf5-b7db-0b59b01a52a7" xlink:href="paa-20221231.xsd#paa_EquityIndexedCompensationPlanAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53e93ab9-f664-42dd-8eb0-bf46dafcf35e" xlink:to="loc_paa_EquityIndexedCompensationPlanAwardMember_9fc94f0a-c199-4bf5-b7db-0b59b01a52a7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/InventoryLinefillandLongtermInventoryComponentsofInventoryLinefillandLongtermInventoryDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#InventoryLinefillandLongtermInventoryComponentsofInventoryLinefillandLongtermInventoryDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/InventoryLinefillandLongtermInventoryComponentsofInventoryLinefillandLongtermInventoryDetails" xlink:type="extended" id="ibc83f56de30b46398fb5cc371765c495_InventoryLinefillandLongtermInventoryComponentsofInventoryLinefillandLongtermInventoryDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InventoryVolumesCurrent_d18a6795-ff9a-42f7-9035-e3fa47c565fd" xlink:href="paa-20221231.xsd#paa_InventoryVolumesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_paa_InventoryVolumesCurrent_d18a6795-ff9a-42f7-9035-e3fa47c565fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InventoryVolumesLinefill_7311e243-0086-4505-887f-d62424fcd962" xlink:href="paa-20221231.xsd#paa_InventoryVolumesLinefill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_paa_InventoryVolumesLinefill_7311e243-0086-4505-887f-d62424fcd962" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InventoryVolumesNoncurrent_a0bda4e4-e9f1-41f4-b21a-5d0d3224bcf7" xlink:href="paa-20221231.xsd#paa_InventoryVolumesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_paa_InventoryVolumesNoncurrent_a0bda4e4-e9f1-41f4-b21a-5d0d3224bcf7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_29159ce0-7425-4f95-bef9-4b2594f25c57" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_us-gaap_InventoryNet_29159ce0-7425-4f95-bef9-4b2594f25c57" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_Linefill_f9726fdb-a343-4a28-a414-313a583fde2f" xlink:href="paa-20221231.xsd#paa_Linefill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_paa_Linefill_f9726fdb-a343-4a28-a414-313a583fde2f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNoncurrent_c8149c1d-e335-4c0c-bccb-4b099029ada7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_us-gaap_InventoryNoncurrent_c8149c1d-e335-4c0c-bccb-4b099029ada7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InventoryCurrentAndNoncurrent_33d5147e-b8dd-4eec-bfca-02a5d2a00d2d" xlink:href="paa-20221231.xsd#paa_InventoryCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_paa_InventoryCurrentAndNoncurrent_33d5147e-b8dd-4eec-bfca-02a5d2a00d2d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InventoryWeightedAveragePricePerUnitCurrent_0668855e-5eb3-481c-8855-5891dbbfa7f3" xlink:href="paa-20221231.xsd#paa_InventoryWeightedAveragePricePerUnitCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_paa_InventoryWeightedAveragePricePerUnitCurrent_0668855e-5eb3-481c-8855-5891dbbfa7f3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InventoryWeightedAveragePricePerUnitLinefill_44dd85e0-c3a7-4923-9892-2c13cc3a3e6f" xlink:href="paa-20221231.xsd#paa_InventoryWeightedAveragePricePerUnitLinefill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_paa_InventoryWeightedAveragePricePerUnitLinefill_44dd85e0-c3a7-4923-9892-2c13cc3a3e6f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InventoryWeightedAveragePricePerUnitNoncurrent_d87544db-7ef7-4b1c-b6cc-6c1200d0e986" xlink:href="paa-20221231.xsd#paa_InventoryWeightedAveragePricePerUnitNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_paa_InventoryWeightedAveragePricePerUnitNoncurrent_d87544db-7ef7-4b1c-b6cc-6c1200d0e986" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryCurrentTable_5b731897-529f-4b50-b4fc-414048af577f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InventoryCurrentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_InventoryLineItems_3909c47d-e71b-4b8c-bc9c-a46c84fc2b39" xlink:to="loc_us-gaap_InventoryCurrentTable_5b731897-529f-4b50-b4fc-414048af577f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryAxis_59eec67d-da4a-4c99-90d4-7826105b85c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PublicUtilitiesInventoryAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_InventoryCurrentTable_5b731897-529f-4b50-b4fc-414048af577f" xlink:to="loc_us-gaap_PublicUtilitiesInventoryAxis_59eec67d-da4a-4c99-90d4-7826105b85c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_59eec67d-da4a-4c99-90d4-7826105b85c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PublicUtilitiesInventoryTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PublicUtilitiesInventoryAxis_59eec67d-da4a-4c99-90d4-7826105b85c9" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_59eec67d-da4a-4c99-90d4-7826105b85c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_227a8d4c-78e9-4ce3-9229-48e13fcc3173" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PublicUtilitiesInventoryTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PublicUtilitiesInventoryAxis_59eec67d-da4a-4c99-90d4-7826105b85c9" xlink:to="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_227a8d4c-78e9-4ce3-9229-48e13fcc3173" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CrudeOilMember_34f865ce-56d3-4e7e-a1e0-59958bbb20cf" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CrudeOilMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_227a8d4c-78e9-4ce3-9229-48e13fcc3173" xlink:to="loc_srt_CrudeOilMember_34f865ce-56d3-4e7e-a1e0-59958bbb20cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NaturalGasLiquidsReservesMember_8bd601c5-82fb-4973-92f4-64926d2860a4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NaturalGasLiquidsReservesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_227a8d4c-78e9-4ce3-9229-48e13fcc3173" xlink:to="loc_srt_NaturalGasLiquidsReservesMember_8bd601c5-82fb-4973-92f4-64926d2860a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OtherInventoryMember_adddf0b2-84ff-4dbb-80dd-953444f4dd7b" xlink:href="paa-20221231.xsd#paa_OtherInventoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PublicUtilitiesInventoryTypeDomain_227a8d4c-78e9-4ce3-9229-48e13fcc3173" xlink:to="loc_paa_OtherInventoryMember_adddf0b2-84ff-4dbb-80dd-953444f4dd7b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PropertyandEquipmentDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PropertyandEquipmentDetails" xlink:type="extended" id="ia83c2d906c7e4c6dab6f99d2c83c8724_PropertyandEquipmentDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_94e57e33-c026-40e3-84b2-2eacf1bdd18d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_94e57e33-c026-40e3-84b2-2eacf1bdd18d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_05299200-4b7d-467c-80a4-f0e213b683b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_05299200-4b7d-467c-80a4-f0e213b683b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_c4ab8b12-4b4e-4a8a-b916-8aaa47fa7519" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_c4ab8b12-4b4e-4a8a-b916-8aaa47fa7519" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_9caed8d0-50b8-4b5a-bd50-e1f430f7bfe9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_9caed8d0-50b8-4b5a-bd50-e1f430f7bfe9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_6ad5a701-c493-4c06-aeed-0a481b9724c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Depreciation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_us-gaap_Depreciation_6ad5a701-c493-4c06-aeed-0a481b9724c8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid_13fb3c6d-680c-4705-a2e4-6167861eaa14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_us-gaap_ConstructionInProgressExpendituresIncurredButNotYetPaid_13fb3c6d-680c-4705-a2e4-6167861eaa14" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_c413f1a9-3085-46d7-9896-8a582ba0fdcc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairmentOfLongLivedAssetsHeldForUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_c413f1a9-3085-46d7-9896-8a582ba0fdcc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentLongLivedAssetHeldForUseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_24c12140-4385-408e-a89a-3de5f64a7d15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairmentLongLivedAssetHeldForUseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_c413f1a9-3085-46d7-9896-8a582ba0fdcc" xlink:to="loc_us-gaap_ImpairmentLongLivedAssetHeldForUseStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_24c12140-4385-408e-a89a-3de5f64a7d15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant_017862f0-4e07-4231-9a8a-afbd5a2d31b6" xlink:href="paa-20221231.xsd#paa_ImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_paa_ImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant_017862f0-4e07-4231-9a8a-afbd5a2d31b6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_b98a5ea2-d1cf-477a-ad1b-0fb276574d0d" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5a601f42-4831-4d95-bcd5-0aff0534e660" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5a601f42-4831-4d95-bcd5-0aff0534e660" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5a601f42-4831-4d95-bcd5-0aff0534e660_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5a601f42-4831-4d95-bcd5-0aff0534e660" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5a601f42-4831-4d95-bcd5-0aff0534e660_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a00ad779-e3f8-4abd-935e-45fc30ec59e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5a601f42-4831-4d95-bcd5-0aff0534e660" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a00ad779-e3f8-4abd-935e-45fc30ec59e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PipelinesMember_e1d4698b-c276-46fc-a2b1-10693f6e18ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PipelinesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a00ad779-e3f8-4abd-935e-45fc30ec59e9" xlink:to="loc_us-gaap_PipelinesMember_e1d4698b-c276-46fc-a2b1-10693f6e18ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_StorageTerminalAndRailFacilitiesMember_28cf2a99-8ed4-4a30-8273-a9ee86a2791b" xlink:href="paa-20221231.xsd#paa_StorageTerminalAndRailFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a00ad779-e3f8-4abd-935e-45fc30ec59e9" xlink:to="loc_paa_StorageTerminalAndRailFacilitiesMember_28cf2a99-8ed4-4a30-8273-a9ee86a2791b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_TruckingEquipmentAndOtherMember_67bf5a8c-553a-4f07-97f8-3f4c0d94deb9" xlink:href="paa-20221231.xsd#paa_TruckingEquipmentAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a00ad779-e3f8-4abd-935e-45fc30ec59e9" xlink:to="loc_paa_TruckingEquipmentAndOtherMember_67bf5a8c-553a-4f07-97f8-3f4c0d94deb9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_44e8e592-82f5-44ae-91a5-7c0d47167aba" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a00ad779-e3f8-4abd-935e-45fc30ec59e9" xlink:to="loc_us-gaap_ConstructionInProgressMember_44e8e592-82f5-44ae-91a5-7c0d47167aba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OfficeEquipmentMember_71e49c93-e1d7-4bd3-bc8a-a98ccb187f9d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OfficeEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a00ad779-e3f8-4abd-935e-45fc30ec59e9" xlink:to="loc_us-gaap_OfficeEquipmentMember_71e49c93-e1d7-4bd3-bc8a-a98ccb187f9d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LandAndOtherMember_c4df3139-0eb7-4c3f-830b-9fdaede1ff6b" xlink:href="paa-20221231.xsd#paa_LandAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a00ad779-e3f8-4abd-935e-45fc30ec59e9" xlink:to="loc_paa_LandAndOtherMember_c4df3139-0eb7-4c3f-830b-9fdaede1ff6b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_8822a13d-51e3-4892-941c-f48c52985a25" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:to="loc_srt_RangeAxis_8822a13d-51e3-4892-941c-f48c52985a25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8822a13d-51e3-4892-941c-f48c52985a25_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_8822a13d-51e3-4892-941c-f48c52985a25" xlink:to="loc_srt_RangeMember_8822a13d-51e3-4892-941c-f48c52985a25_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_44e7af92-6a2c-4149-9cbc-af1a578bba2e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_8822a13d-51e3-4892-941c-f48c52985a25" xlink:to="loc_srt_RangeMember_44e7af92-6a2c-4149-9cbc-af1a578bba2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_f612bc64-2647-4eeb-be45-f617de25e3d8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_44e7af92-6a2c-4149-9cbc-af1a578bba2e" xlink:to="loc_srt_MinimumMember_f612bc64-2647-4eeb-be45-f617de25e3d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_4c6fbbab-d3b4-47e7-89e3-458e4eca09b7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_44e7af92-6a2c-4149-9cbc-af1a578bba2e" xlink:to="loc_srt_MaximumMember_4c6fbbab-d3b4-47e7-89e3-458e4eca09b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_798db1bd-907b-47b4-a762-c89e8546df83" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_798db1bd-907b-47b4-a762-c89e8546df83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_798db1bd-907b-47b4-a762-c89e8546df83_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_798db1bd-907b-47b4-a762-c89e8546df83" xlink:to="loc_us-gaap_SegmentDomain_798db1bd-907b-47b4-a762-c89e8546df83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2225ba58-458a-42be-93e5-fb0bb86b1f1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_798db1bd-907b-47b4-a762-c89e8546df83" xlink:to="loc_us-gaap_SegmentDomain_2225ba58-458a-42be-93e5-fb0bb86b1f1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilSegmentMember_3f691cab-6ce0-45a6-9580-b6198c1c7a80" xlink:href="paa-20221231.xsd#paa_CrudeOilSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_2225ba58-458a-42be-93e5-fb0bb86b1f1b" xlink:to="loc_paa_CrudeOilSegmentMember_3f691cab-6ce0-45a6-9580-b6198c1c7a80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c5e187da-74e6-4037-a355-bc97de9d14f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c5e187da-74e6-4037-a355-bc97de9d14f6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c5e187da-74e6-4037-a355-bc97de9d14f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c5e187da-74e6-4037-a355-bc97de9d14f6" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c5e187da-74e6-4037-a355-bc97de9d14f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8c0df85f-3f58-42b9-bdef-72d1be8a6675" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c5e187da-74e6-4037-a355-bc97de9d14f6" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8c0df85f-3f58-42b9-bdef-72d1be8a6675" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_d4c622a9-28b7-45e1-8e11-3da7675d0b45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8c0df85f-3f58-42b9-bdef-72d1be8a6675" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_d4c622a9-28b7-45e1-8e11-3da7675d0b45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_a4f5d9a7-5056-4fb4-863f-cc7a857dad3b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_a4f5d9a7-5056-4fb4-863f-cc7a857dad3b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_a4f5d9a7-5056-4fb4-863f-cc7a857dad3b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_a4f5d9a7-5056-4fb4-863f-cc7a857dad3b" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_a4f5d9a7-5056-4fb4-863f-cc7a857dad3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_7b2b2364-2fa2-4887-9c38-e054f9c2215e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_a4f5d9a7-5056-4fb4-863f-cc7a857dad3b" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_7b2b2364-2fa2-4887-9c38-e054f9c2215e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_e427de0e-c7b8-498b-b955-3e04cf765134" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_7b2b2364-2fa2-4887-9c38-e054f9c2215e" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_e427de0e-c7b8-498b-b955-3e04cf765134" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_d5719a98-e016-48b8-8da9-a39e7716c2e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:to="loc_us-gaap_ValuationTechniqueAxis_d5719a98-e016-48b8-8da9-a39e7716c2e6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_d5719a98-e016-48b8-8da9-a39e7716c2e6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_d5719a98-e016-48b8-8da9-a39e7716c2e6" xlink:to="loc_us-gaap_ValuationTechniqueDomain_d5719a98-e016-48b8-8da9-a39e7716c2e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_12837f1f-081a-4059-816f-b3de41d44319" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_d5719a98-e016-48b8-8da9-a39e7716c2e6" xlink:to="loc_us-gaap_ValuationTechniqueDomain_12837f1f-081a-4059-816f-b3de41d44319" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_1746c9f7-ac22-49b8-8dfa-a73153fa160f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_12837f1f-081a-4059-816f-b3de41d44319" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_1746c9f7-ac22-49b8-8dfa-a73153fa160f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_ab0f93a8-33bb-42fc-8d1e-82d5557716c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_272e8c39-2d7e-4dce-8f47-1efcbe0346f7" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_ab0f93a8-33bb-42fc-8d1e-82d5557716c2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_ab0f93a8-33bb-42fc-8d1e-82d5557716c2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_ab0f93a8-33bb-42fc-8d1e-82d5557716c2" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_ab0f93a8-33bb-42fc-8d1e-82d5557716c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_239a5520-6477-4301-acc7-0fd1edd4cd53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis_ab0f93a8-33bb-42fc-8d1e-82d5557716c2" xlink:to="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_239a5520-6477-4301-acc7-0fd1edd4cd53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PipelinesMember_9cc3e37d-d1b2-43bf-b119-5336ea2e205b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PipelinesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_239a5520-6477-4301-acc7-0fd1edd4cd53" xlink:to="loc_us-gaap_PipelinesMember_9cc3e37d-d1b2-43bf-b119-5336ea2e205b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilStorageTerminalAssetsMember_6269d379-6a7c-4e05-8ede-5f2a6362514b" xlink:href="paa-20221231.xsd#paa_CrudeOilStorageTerminalAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_239a5520-6477-4301-acc7-0fd1edd4cd53" xlink:to="loc_paa_CrudeOilStorageTerminalAssetsMember_6269d379-6a7c-4e05-8ede-5f2a6362514b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CaliforniaAssetsMember_93b849d7-61e7-4af0-b128-34603724529d" xlink:href="paa-20221231.xsd#paa_CaliforniaAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ImpairedLongLivedAssetsHeldAndUsedAssetNameDomain_239a5520-6477-4301-acc7-0fd1edd4cd53" xlink:to="loc_paa_CaliforniaAssetsMember_93b849d7-61e7-4af0-b128-34603724529d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsCactusIIDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsCactusIIDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsCactusIIDetails" xlink:type="extended" id="ibf956e6296ad4ef489bd0d4cb984a42f_AcquisitionsDivestituresandOtherTransactionsCactusIIDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_5e00075c-e0ec-40be-86b5-95ff75505f20" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_5e00075c-e0ec-40be-86b5-95ff75505f20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_db85d7b3-a458-4c0f-8e95-287e3e2bb0dc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_db85d7b3-a458-4c0f-8e95-287e3e2bb0dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_479fe2ca-8c9e-42da-b446-76738938470a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_479fe2ca-8c9e-42da-b446-76738938470a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_19db388b-4743-4342-bd50-da8ab1830963" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_19db388b-4743-4342-bd50-da8ab1830963" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_6a3eae7a-81cc-4ec6-9d9b-50e0fbfda272" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_6a3eae7a-81cc-4ec6-9d9b-50e0fbfda272" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_3dd5e14a-e1d9-4e78-8066-b989f38e9d0e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_3dd5e14a-e1d9-4e78-8066-b989f38e9d0e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1_8f801b14-e2c9-4531-bea6-77277f26ab65" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1_8f801b14-e2c9-4531-bea6-77277f26ab65" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BusinessCombinationMeasurementInput_f572cc2f-81b9-43bd-adab-016066af57b8" xlink:href="paa-20221231.xsd#paa_BusinessCombinationMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_paa_BusinessCombinationMeasurementInput_f572cc2f-81b9-43bd-adab-016066af57b8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_cc12db9b-6493-4d8e-829e-e6102a1e56e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain_cc12db9b-6493-4d8e-829e-e6102a1e56e7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_6417eee7-d075-447d-a8f1-e0d453129be1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_6417eee7-d075-447d-a8f1-e0d453129be1" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_166c57fe-0183-4eed-9a2d-a67fcf26ad14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_166c57fe-0183-4eed-9a2d-a67fcf26ad14" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_7af67ac6-8c6e-413a-88e5-421ff22a963b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_AdjustmentForAmortization_7af67ac6-8c6e-413a-88e5-421ff22a963b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage_ad3d8498-0c5b-4fca-ace3-3f55dd8b2f07" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage_ad3d8498-0c5b-4fca-ace3-3f55dd8b2f07" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_52039ff0-a0bc-4e5d-b77e-ed1711c4ab28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_52039ff0-a0bc-4e5d-b77e-ed1711c4ab28" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_dd97a18d-5d4f-4665-bc5a-9e077e114001" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_228fb944-7b60-4449-8676-bc638e1284a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_228fb944-7b60-4449-8676-bc638e1284a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_228fb944-7b60-4449-8676-bc638e1284a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_228fb944-7b60-4449-8676-bc638e1284a2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_228fb944-7b60-4449-8676-bc638e1284a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5be7ab18-7b7a-4580-8423-da9563fe9f41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_228fb944-7b60-4449-8676-bc638e1284a2" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5be7ab18-7b7a-4580-8423-da9563fe9f41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_575752cc-cc3a-4cda-a3a4-6516d4618a9d" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5be7ab18-7b7a-4580-8423-da9563fe9f41" xlink:to="loc_paa_CactusIIPipelineLLCMember_575752cc-cc3a-4cda-a3a4-6516d4618a9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_db1489af-0c2d-4284-a98f-1e26d7ad8a79" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_srt_OwnershipAxis_db1489af-0c2d-4284-a98f-1e26d7ad8a79" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_db1489af-0c2d-4284-a98f-1e26d7ad8a79_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_db1489af-0c2d-4284-a98f-1e26d7ad8a79" xlink:to="loc_srt_OwnershipDomain_db1489af-0c2d-4284-a98f-1e26d7ad8a79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_15b56071-46ad-490f-a39a-69db706129b3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_db1489af-0c2d-4284-a98f-1e26d7ad8a79" xlink:to="loc_srt_OwnershipDomain_15b56071-46ad-490f-a39a-69db706129b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_c5865c8e-b527-49aa-9529-fd88d4221680" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_15b56071-46ad-490f-a39a-69db706129b3" xlink:to="loc_paa_CactusIIPipelineLLCMember_c5865c8e-b527-49aa-9529-fd88d4221680" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_17efe8cc-60b5-4d39-a933-6c9d93d8d76c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_17efe8cc-60b5-4d39-a933-6c9d93d8d76c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_17efe8cc-60b5-4d39-a933-6c9d93d8d76c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_17efe8cc-60b5-4d39-a933-6c9d93d8d76c" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_17efe8cc-60b5-4d39-a933-6c9d93d8d76c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_76b789d7-6acf-4b3a-beca-5ac925634182" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_17efe8cc-60b5-4d39-a933-6c9d93d8d76c" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_76b789d7-6acf-4b3a-beca-5ac925634182" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_7223760c-f05c-4242-a80f-20fe4b54e37b" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_76b789d7-6acf-4b3a-beca-5ac925634182" xlink:to="loc_paa_CactusIIPipelineLLCMember_7223760c-f05c-4242-a80f-20fe4b54e37b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_2c401f7f-a4c8-43be-826f-f1f0d1b97cf8" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_dei_LegalEntityAxis_2c401f7f-a4c8-43be-826f-f1f0d1b97cf8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_2c401f7f-a4c8-43be-826f-f1f0d1b97cf8_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_2c401f7f-a4c8-43be-826f-f1f0d1b97cf8" xlink:to="loc_dei_EntityDomain_2c401f7f-a4c8-43be-826f-f1f0d1b97cf8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_1842a2fa-987f-4ad0-853d-79bf326b2020" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_2c401f7f-a4c8-43be-826f-f1f0d1b97cf8" xlink:to="loc_dei_EntityDomain_1842a2fa-987f-4ad0-853d-79bf326b2020" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAndEnbridgeMember_84f8c476-4c23-4312-a39f-6b9039db3f93" xlink:href="paa-20221231.xsd#paa_PlainsAndEnbridgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_1842a2fa-987f-4ad0-853d-79bf326b2020" xlink:to="loc_paa_PlainsAndEnbridgeMember_84f8c476-4c23-4312-a39f-6b9039db3f93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EnbridgeMember_14c78b5f-3058-4349-b60b-026fe262e319" xlink:href="paa-20221231.xsd#paa_EnbridgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_1842a2fa-987f-4ad0-853d-79bf326b2020" xlink:to="loc_paa_EnbridgeMember_14c78b5f-3058-4349-b60b-026fe262e319" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_38da35c9-266b-4cba-9cd4-43b7b3622117" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_srt_CounterpartyNameAxis_38da35c9-266b-4cba-9cd4-43b7b3622117" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_38da35c9-266b-4cba-9cd4-43b7b3622117_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_38da35c9-266b-4cba-9cd4-43b7b3622117" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_38da35c9-266b-4cba-9cd4-43b7b3622117_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_68890e0a-76ba-45e6-b566-99549fea5ebc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_38da35c9-266b-4cba-9cd4-43b7b3622117" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_68890e0a-76ba-45e6-b566-99549fea5ebc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_WesternMidstreamPartnersLPMember_fd67f93a-5e39-4e31-855d-00fcb0e87857" xlink:href="paa-20221231.xsd#paa_WesternMidstreamPartnersLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_68890e0a-76ba-45e6-b566-99549fea5ebc" xlink:to="loc_paa_WesternMidstreamPartnersLPMember_fd67f93a-5e39-4e31-855d-00fcb0e87857" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_bd6983c4-f70e-4833-a77a-f16879ec9313" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_bd6983c4-f70e-4833-a77a-f16879ec9313" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bd6983c4-f70e-4833-a77a-f16879ec9313_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_bd6983c4-f70e-4833-a77a-f16879ec9313" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bd6983c4-f70e-4833-a77a-f16879ec9313_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ce90cb7d-da79-4a91-bc82-6c6630e79c9b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_bd6983c4-f70e-4833-a77a-f16879ec9313" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ce90cb7d-da79-4a91-bc82-6c6630e79c9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_e6252918-cda6-4a74-bb7d-7d3f149229bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ce90cb7d-da79-4a91-bc82-6c6630e79c9b" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_e6252918-cda6-4a74-bb7d-7d3f149229bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_ba2e9b4f-5b25-409e-887c-5e982d6b494f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_ba2e9b4f-5b25-409e-887c-5e982d6b494f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_ba2e9b4f-5b25-409e-887c-5e982d6b494f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_ba2e9b4f-5b25-409e-887c-5e982d6b494f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_ba2e9b4f-5b25-409e-887c-5e982d6b494f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_d339bf8b-1a6d-4dde-8621-79ca328fa98d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_ba2e9b4f-5b25-409e-887c-5e982d6b494f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_d339bf8b-1a6d-4dde-8621-79ca328fa98d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_abf83ee4-9248-4934-995c-b02d67c34b8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_d339bf8b-1a6d-4dde-8621-79ca328fa98d" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_abf83ee4-9248-4934-995c-b02d67c34b8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_09ffc4a7-2132-4b43-9f8a-1d4767fc3f3c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_us-gaap_ValuationTechniqueAxis_09ffc4a7-2132-4b43-9f8a-1d4767fc3f3c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_09ffc4a7-2132-4b43-9f8a-1d4767fc3f3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_09ffc4a7-2132-4b43-9f8a-1d4767fc3f3c" xlink:to="loc_us-gaap_ValuationTechniqueDomain_09ffc4a7-2132-4b43-9f8a-1d4767fc3f3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_a49916c3-f7e0-43e5-a675-6fc0b29187a6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_09ffc4a7-2132-4b43-9f8a-1d4767fc3f3c" xlink:to="loc_us-gaap_ValuationTechniqueDomain_a49916c3-f7e0-43e5-a675-6fc0b29187a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_eef2322b-3c7c-4c59-b2c1-2c427e6df48c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_a49916c3-f7e0-43e5-a675-6fc0b29187a6" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_eef2322b-3c7c-4c59-b2c1-2c427e6df48c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5877e82f-a1ca-425e-9a45-a76317647c15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5877e82f-a1ca-425e-9a45-a76317647c15" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5877e82f-a1ca-425e-9a45-a76317647c15_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5877e82f-a1ca-425e-9a45-a76317647c15" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5877e82f-a1ca-425e-9a45-a76317647c15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f4dfb630-cc35-49bd-8473-e4c91ead507c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_5877e82f-a1ca-425e-9a45-a76317647c15" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f4dfb630-cc35-49bd-8473-e4c91ead507c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_7ba380e9-433d-4866-bcf6-0b0879dfacfa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_f4dfb630-cc35-49bd-8473-e4c91ead507c" xlink:to="loc_us-gaap_CustomerRelationshipsMember_7ba380e9-433d-4866-bcf6-0b0879dfacfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_9398fc7b-c1ed-4269-9766-1aa4b8e81478" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_9398fc7b-c1ed-4269-9766-1aa4b8e81478" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9398fc7b-c1ed-4269-9766-1aa4b8e81478_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_9398fc7b-c1ed-4269-9766-1aa4b8e81478" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_9398fc7b-c1ed-4269-9766-1aa4b8e81478_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2355e4a7-d572-4ff1-8473-27561cfcdc44" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_9398fc7b-c1ed-4269-9766-1aa4b8e81478" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2355e4a7-d572-4ff1-8473-27561cfcdc44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMember_7db0ea86-3f43-4c68-a910-6571d900d20b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2355e4a7-d572-4ff1-8473-27561cfcdc44" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMember_7db0ea86-3f43-4c68-a910-6571d900d20b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_19fb904a-02c9-4b14-b84c-1b69f511fe41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_19fb904a-02c9-4b14-b84c-1b69f511fe41" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_19fb904a-02c9-4b14-b84c-1b69f511fe41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_19fb904a-02c9-4b14-b84c-1b69f511fe41" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_19fb904a-02c9-4b14-b84c-1b69f511fe41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_66981a20-94e7-44dc-bebf-d09809d84b12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_19fb904a-02c9-4b14-b84c-1b69f511fe41" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_66981a20-94e7-44dc-bebf-d09809d84b12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_d9867196-e2f3-4f19-b05b-0be86725ce2f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_66981a20-94e7-44dc-bebf-d09809d84b12" xlink:to="loc_us-gaap_NoncontrollingInterestMember_d9867196-e2f3-4f19-b05b-0be86725ce2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_31a563a3-ccbf-4cc5-bdac-485efeb0a168" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e736adc2-68ba-4d04-946d-2df11d8cd165" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_31a563a3-ccbf-4cc5-bdac-485efeb0a168" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_31a563a3-ccbf-4cc5-bdac-485efeb0a168_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_31a563a3-ccbf-4cc5-bdac-485efeb0a168" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_31a563a3-ccbf-4cc5-bdac-485efeb0a168_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_9a58c8c5-deca-451f-884c-fc1054031606" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_31a563a3-ccbf-4cc5-bdac-485efeb0a168" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_9a58c8c5-deca-451f-884c-fc1054031606" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNetMember_fb0e6a7d-710b-4364-a287-dacfc0adab11" xlink:href="paa-20221231.xsd#paa_GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_9a58c8c5-deca-451f-884c-fc1054031606" xlink:to="loc_paa_GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNetMember_fb0e6a7d-710b-4364-a287-dacfc0adab11" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended" id="icf0c29eef42d4cb898f6e8aaf1032af6_AcquisitionsDivestituresandOtherTransactionsAssetsAcquiredandLiabilitiesAssumedDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_4fa1cde7-e5e5-4630-b1f6-5d80fdcdbaf6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_4fa1cde7-e5e5-4630-b1f6-5d80fdcdbaf6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_71ed7b8a-aca8-4836-afed-84616f69c657" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_71ed7b8a-aca8-4836-afed-84616f69c657" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_517a06c5-4666-4434-a25c-98c91c41a562" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_517a06c5-4666-4434-a25c-98c91c41a562" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_0ae0d674-2073-47de-a10c-919b3df71838" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_0ae0d674-2073-47de-a10c-919b3df71838" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestmentInUnconsolidatedEntities_eb107c8c-c7a6-423e-86db-0355d88e0f32" xlink:href="paa-20221231.xsd#paa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestmentInUnconsolidatedEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:to="loc_paa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInvestmentInUnconsolidatedEntities_eb107c8c-c7a6-423e-86db-0355d88e0f32" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAndOtherAssetsAndLiabilities_fc24fd8c-78e1-4b48-bf3f-83f2dbaa94b3" xlink:href="paa-20221231.xsd#paa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAndOtherAssetsAndLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:to="loc_paa_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAndOtherAssetsAndLiabilities_fc24fd8c-78e1-4b48-bf3f-83f2dbaa94b3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_b67954f3-10e9-4fca-aa4b-12f8b09e17a4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_b67954f3-10e9-4fca-aa4b-12f8b09e17a4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cb500237-cc2a-4ddf-b0ea-db052b249d92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_b73faad7-4288-4a9f-9438-7f2bd8fb1d45" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cb500237-cc2a-4ddf-b0ea-db052b249d92" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5dc54275-70f7-4f7e-9da5-3f0907cafe69" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cb500237-cc2a-4ddf-b0ea-db052b249d92" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5dc54275-70f7-4f7e-9da5-3f0907cafe69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5dc54275-70f7-4f7e-9da5-3f0907cafe69_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5dc54275-70f7-4f7e-9da5-3f0907cafe69" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5dc54275-70f7-4f7e-9da5-3f0907cafe69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b5ff7dc0-9d39-4e9c-8590-5f4fd36a454f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5dc54275-70f7-4f7e-9da5-3f0907cafe69" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b5ff7dc0-9d39-4e9c-8590-5f4fd36a454f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_bef7d029-8f9e-4d85-88fd-27b651036d2e" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b5ff7dc0-9d39-4e9c-8590-5f4fd36a454f" xlink:to="loc_paa_CactusIIPipelineLLCMember_bef7d029-8f9e-4d85-88fd-27b651036d2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_73a774dd-7b3c-41d8-9201-1738a2421d80" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b5ff7dc0-9d39-4e9c-8590-5f4fd36a454f" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_73a774dd-7b3c-41d8-9201-1738a2421d80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_30f1ff73-692e-4d14-b654-d3db260c3df9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cb500237-cc2a-4ddf-b0ea-db052b249d92" xlink:to="loc_srt_CounterpartyNameAxis_30f1ff73-692e-4d14-b654-d3db260c3df9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_30f1ff73-692e-4d14-b654-d3db260c3df9_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_30f1ff73-692e-4d14-b654-d3db260c3df9" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_30f1ff73-692e-4d14-b654-d3db260c3df9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0b9cca7b-79ed-4dab-8abf-2e95f8784893" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_30f1ff73-692e-4d14-b654-d3db260c3df9" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0b9cca7b-79ed-4dab-8abf-2e95f8784893" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_da94fbce-7aab-4277-8647-902e4a1a75b7" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0b9cca7b-79ed-4dab-8abf-2e95f8784893" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_da94fbce-7aab-4277-8647-902e4a1a75b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_ad0453bb-f09b-4851-9ca2-d203e6500d21" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cb500237-cc2a-4ddf-b0ea-db052b249d92" xlink:to="loc_us-gaap_TransactionTypeAxis_ad0453bb-f09b-4851-9ca2-d203e6500d21" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_ad0453bb-f09b-4851-9ca2-d203e6500d21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_ad0453bb-f09b-4851-9ca2-d203e6500d21" xlink:to="loc_us-gaap_TransactionDomain_ad0453bb-f09b-4851-9ca2-d203e6500d21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_80615f81-9aee-447c-9ca7-b715cb79adea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_ad0453bb-f09b-4851-9ca2-d203e6500d21" xlink:to="loc_us-gaap_TransactionDomain_80615f81-9aee-447c-9ca7-b715cb79adea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_JointVentureFormationMember_5e5fc86e-7fb9-458f-8e5e-a242c629a8fa" xlink:href="paa-20221231.xsd#paa_JointVentureFormationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_80615f81-9aee-447c-9ca7-b715cb79adea" xlink:to="loc_paa_JointVentureFormationMember_5e5fc86e-7fb9-458f-8e5e-a242c629a8fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_df08c81a-8962-4578-ba68-b98c20f6bfd7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_cb500237-cc2a-4ddf-b0ea-db052b249d92" xlink:to="loc_srt_RangeAxis_df08c81a-8962-4578-ba68-b98c20f6bfd7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_df08c81a-8962-4578-ba68-b98c20f6bfd7_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_df08c81a-8962-4578-ba68-b98c20f6bfd7" xlink:to="loc_srt_RangeMember_df08c81a-8962-4578-ba68-b98c20f6bfd7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f7a7bf16-9e9c-4e28-973e-93df259924db" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_df08c81a-8962-4578-ba68-b98c20f6bfd7" xlink:to="loc_srt_RangeMember_f7a7bf16-9e9c-4e28-973e-93df259924db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_2e8adf0b-0c8e-4413-961c-49f760cb7e66" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f7a7bf16-9e9c-4e28-973e-93df259924db" xlink:to="loc_srt_MinimumMember_2e8adf0b-0c8e-4413-961c-49f760cb7e66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_5486b6f4-e98b-4eaf-b9de-2ecd710de989" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_f7a7bf16-9e9c-4e28-973e-93df259924db" xlink:to="loc_srt_MaximumMember_5486b6f4-e98b-4eaf-b9de-2ecd710de989" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsFutureAmortizationExpenseDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsFutureAmortizationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsFutureAmortizationExpenseDetails" xlink:type="extended" id="i890cc4e984f2445985ee7ef900b3939a_AcquisitionsDivestituresandOtherTransactionsFutureAmortizationExpenseDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_89c83513-c41c-4eb9-b15a-2e13126bd4e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_2d8df34c-b938-4bb1-8133-9c4cd345530c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89c83513-c41c-4eb9-b15a-2e13126bd4e7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_2d8df34c-b938-4bb1-8133-9c4cd345530c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_9d81b43a-6957-4199-bf5d-a13f9100b642" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89c83513-c41c-4eb9-b15a-2e13126bd4e7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_9d81b43a-6957-4199-bf5d-a13f9100b642" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_26c72047-453b-46b4-bb2a-7b3f66df4603" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89c83513-c41c-4eb9-b15a-2e13126bd4e7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_26c72047-453b-46b4-bb2a-7b3f66df4603" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2d22d5af-2440-4bb5-97ef-6b1673a551b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89c83513-c41c-4eb9-b15a-2e13126bd4e7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_2d22d5af-2440-4bb5-97ef-6b1673a551b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_55f9ef88-5be9-494d-9131-a5fabb72cfd8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89c83513-c41c-4eb9-b15a-2e13126bd4e7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_55f9ef88-5be9-494d-9131-a5fabb72cfd8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4634628f-bb37-4e2c-af06-2406220136b0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_89c83513-c41c-4eb9-b15a-2e13126bd4e7" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4634628f-bb37-4e2c-af06-2406220136b0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_6616d654-039e-4725-a5eb-b36ee485275a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4634628f-bb37-4e2c-af06-2406220136b0" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_6616d654-039e-4725-a5eb-b36ee485275a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6616d654-039e-4725-a5eb-b36ee485275a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6616d654-039e-4725-a5eb-b36ee485275a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6616d654-039e-4725-a5eb-b36ee485275a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_84b89b6c-c43c-4a31-a4e7-4165d9e99e72" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6616d654-039e-4725-a5eb-b36ee485275a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_84b89b6c-c43c-4a31-a4e7-4165d9e99e72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_bc785276-a01d-4048-89aa-10c21149d497" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_84b89b6c-c43c-4a31-a4e7-4165d9e99e72" xlink:to="loc_paa_CactusIIPipelineLLCMember_bc785276-a01d-4048-89aa-10c21149d497" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_288ba01c-45eb-4285-a4e7-e2c4852a3fe3" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_84b89b6c-c43c-4a31-a4e7-4165d9e99e72" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_288ba01c-45eb-4285-a4e7-e2c4852a3fe3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_d9212bde-8f67-4be6-bd0f-02a28a155540" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4634628f-bb37-4e2c-af06-2406220136b0" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_d9212bde-8f67-4be6-bd0f-02a28a155540" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d9212bde-8f67-4be6-bd0f-02a28a155540_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_d9212bde-8f67-4be6-bd0f-02a28a155540" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d9212bde-8f67-4be6-bd0f-02a28a155540_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b287cff2-a1d4-46ca-95ff-67a6ad96a9f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_d9212bde-8f67-4be6-bd0f-02a28a155540" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b287cff2-a1d4-46ca-95ff-67a6ad96a9f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_70384592-a913-4496-9c7e-11800eb9a858" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_b287cff2-a1d4-46ca-95ff-67a6ad96a9f7" xlink:to="loc_us-gaap_CustomerRelationshipsMember_70384592-a913-4496-9c7e-11800eb9a858" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_7acc5906-91ab-49b5-9e02-68992c84ca58" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_4634628f-bb37-4e2c-af06-2406220136b0" xlink:to="loc_us-gaap_TransactionTypeAxis_7acc5906-91ab-49b5-9e02-68992c84ca58" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_7acc5906-91ab-49b5-9e02-68992c84ca58_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_7acc5906-91ab-49b5-9e02-68992c84ca58" xlink:to="loc_us-gaap_TransactionDomain_7acc5906-91ab-49b5-9e02-68992c84ca58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_f3af7e32-04bc-4b2a-b8c6-cd2d073fedaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_7acc5906-91ab-49b5-9e02-68992c84ca58" xlink:to="loc_us-gaap_TransactionDomain_f3af7e32-04bc-4b2a-b8c6-cd2d073fedaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_JointVentureFormationMember_bf0d715e-c191-437a-9ff6-3691114618ed" xlink:href="paa-20221231.xsd#paa_JointVentureFormationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_f3af7e32-04bc-4b2a-b8c6-cd2d073fedaa" xlink:to="loc_paa_JointVentureFormationMember_bf0d715e-c191-437a-9ff6-3691114618ed" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsOtherAcquisitionsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsOtherAcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsOtherAcquisitionsDetails" xlink:type="extended" id="i79f20c42dab5401b8838f21aae1afd7b_AcquisitionsDivestituresandOtherTransactionsOtherAcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_2b049ee3-afb1-4ee3-9c70-4226cfe9571f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_2b049ee3-afb1-4ee3-9c70-4226cfe9571f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_9f1a3b34-c8bc-45a2-8668-65a5aa5d4c50" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_9f1a3b34-c8bc-45a2-8668-65a5aa5d4c50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_d1fd2d03-dff9-4174-959a-83bf46cc0294" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_d1fd2d03-dff9-4174-959a-83bf46cc0294" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ObligationProcessingCapacityTerm_f4a3a303-e1b5-462e-87e2-2374dbdcc32d" xlink:href="paa-20221231.xsd#paa_ObligationProcessingCapacityTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_paa_ObligationProcessingCapacityTerm_f4a3a303-e1b5-462e-87e2-2374dbdcc32d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ContractWithCustomerLiabilityRevenueRecognitionTerm_c85d88ec-c85a-467d-822a-232429b9ad87" xlink:href="paa-20221231.xsd#paa_ContractWithCustomerLiabilityRevenueRecognitionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_paa_ContractWithCustomerLiabilityRevenueRecognitionTerm_c85d88ec-c85a-467d-822a-232429b9ad87" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_bf243fde-5e61-4d2e-b73d-2bf8a5c2c419" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesAndInterestInAffiliates_bf243fde-5e61-4d2e-b73d-2bf8a5c2c419" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_9712ab22-1fd7-4eab-8a70-90ae12fd977f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_9712ab22-1fd7-4eab-8a70-90ae12fd977f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_d3542b46-1a3d-4e8c-855d-afddfbd311aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_d3542b46-1a3d-4e8c-855d-afddfbd311aa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BusinessCombinationMeasurementInput_853b10d8-2d85-43ff-85df-de69245b2a98" xlink:href="paa-20221231.xsd#paa_BusinessCombinationMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_paa_BusinessCombinationMeasurementInput_853b10d8-2d85-43ff-85df-de69245b2a98" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionConsiderationTransferred_68c8ef6a-e9bd-4907-993b-1354f70e8752" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetAcquisitionConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_us-gaap_AssetAcquisitionConsiderationTransferred_68c8ef6a-e9bd-4907-993b-1354f70e8752" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_59daa39b-0247-47c8-a3be-b121165443c2" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionAxis_9d560eb6-b9ca-45cb-90ff-a96c6f0cf7f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_us-gaap_AssetAcquisitionAxis_9d560eb6-b9ca-45cb-90ff-a96c6f0cf7f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_9d560eb6-b9ca-45cb-90ff-a96c6f0cf7f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetAcquisitionAxis_9d560eb6-b9ca-45cb-90ff-a96c6f0cf7f5" xlink:to="loc_us-gaap_AssetAcquisitionDomain_9d560eb6-b9ca-45cb-90ff-a96c6f0cf7f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_0d14f7ba-eb19-485e-baaf-d7b5181816d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetAcquisitionAxis_9d560eb6-b9ca-45cb-90ff-a96c6f0cf7f5" xlink:to="loc_us-gaap_AssetAcquisitionDomain_0d14f7ba-eb19-485e-baaf-d7b5181816d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CertainStraddlePlantsMember_8b84a526-812d-4420-81c4-2a03dc406826" xlink:href="paa-20221231.xsd#paa_CertainStraddlePlantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionDomain_0d14f7ba-eb19-485e-baaf-d7b5181816d4" xlink:to="loc_paa_CertainStraddlePlantsMember_8b84a526-812d-4420-81c4-2a03dc406826" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_eb597e84-5572-4d9d-a4c3-7786979697c9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_eb597e84-5572-4d9d-a4c3-7786979697c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eb597e84-5572-4d9d-a4c3-7786979697c9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_eb597e84-5572-4d9d-a4c3-7786979697c9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eb597e84-5572-4d9d-a4c3-7786979697c9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_db538d8f-caef-4d00-b822-4862e8eae27d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_eb597e84-5572-4d9d-a4c3-7786979697c9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_db538d8f-caef-4d00-b822-4862e8eae27d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AdvantagePipelineHoldingsLLCMember_1cc4693c-2b7a-49b5-a687-77a3360ad860" xlink:href="paa-20221231.xsd#paa_AdvantagePipelineHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_db538d8f-caef-4d00-b822-4862e8eae27d" xlink:to="loc_paa_AdvantagePipelineHoldingsLLCMember_1cc4693c-2b7a-49b5-a687-77a3360ad860" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_FMGatheringLLCMember_da581c08-273c-433a-b675-8e003eda052d" xlink:href="paa-20221231.xsd#paa_FMGatheringLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_db538d8f-caef-4d00-b822-4862e8eae27d" xlink:to="loc_paa_FMGatheringLLCMember_da581c08-273c-433a-b675-8e003eda052d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_73f43de4-b4b7-4b25-a910-bce4f101416d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_srt_RangeAxis_73f43de4-b4b7-4b25-a910-bce4f101416d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_73f43de4-b4b7-4b25-a910-bce4f101416d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_73f43de4-b4b7-4b25-a910-bce4f101416d" xlink:to="loc_srt_RangeMember_73f43de4-b4b7-4b25-a910-bce4f101416d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7185cb9f-d4fb-4e92-9a3e-56e7883229a8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_73f43de4-b4b7-4b25-a910-bce4f101416d" xlink:to="loc_srt_RangeMember_7185cb9f-d4fb-4e92-9a3e-56e7883229a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_40fd27a3-9f53-41d3-bcf1-1e79770b08de" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7185cb9f-d4fb-4e92-9a3e-56e7883229a8" xlink:to="loc_srt_MinimumMember_40fd27a3-9f53-41d3-bcf1-1e79770b08de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_d9393674-b53a-4813-9b8c-89963f2e4a1a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_7185cb9f-d4fb-4e92-9a3e-56e7883229a8" xlink:to="loc_srt_MaximumMember_d9393674-b53a-4813-9b8c-89963f2e4a1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7d57ee70-c8fb-42fc-bbe2-917884bce611" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7d57ee70-c8fb-42fc-bbe2-917884bce611" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7d57ee70-c8fb-42fc-bbe2-917884bce611_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7d57ee70-c8fb-42fc-bbe2-917884bce611" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_7d57ee70-c8fb-42fc-bbe2-917884bce611_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5eaa5211-c152-414d-b197-c06ff7730360" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_7d57ee70-c8fb-42fc-bbe2-917884bce611" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5eaa5211-c152-414d-b197-c06ff7730360" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_8781ccc0-37a5-4d94-8b5b-8bf2494bc395" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_5eaa5211-c152-414d-b197-c06ff7730360" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_8781ccc0-37a5-4d94-8b5b-8bf2494bc395" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_15a69964-9fcd-481f-96a2-49688663a4cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_15a69964-9fcd-481f-96a2-49688663a4cd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_15a69964-9fcd-481f-96a2-49688663a4cd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_15a69964-9fcd-481f-96a2-49688663a4cd" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_15a69964-9fcd-481f-96a2-49688663a4cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_8a77852c-2435-4947-a578-98ad99d86b7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_15a69964-9fcd-481f-96a2-49688663a4cd" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_8a77852c-2435-4947-a578-98ad99d86b7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_1b2e7b0b-aff4-4708-9375-2e4f5fbf6a5a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_8a77852c-2435-4947-a578-98ad99d86b7a" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_1b2e7b0b-aff4-4708-9375-2e4f5fbf6a5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_b96ea871-395d-40b2-b74c-576c76378653" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_us-gaap_ValuationTechniqueAxis_b96ea871-395d-40b2-b74c-576c76378653" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_b96ea871-395d-40b2-b74c-576c76378653_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_b96ea871-395d-40b2-b74c-576c76378653" xlink:to="loc_us-gaap_ValuationTechniqueDomain_b96ea871-395d-40b2-b74c-576c76378653_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_5e65a75d-98fd-4aba-97f1-f24edce85950" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_b96ea871-395d-40b2-b74c-576c76378653" xlink:to="loc_us-gaap_ValuationTechniqueDomain_5e65a75d-98fd-4aba-97f1-f24edce85950" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_75512153-6386-4136-8cbc-266b0efc79d9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_5e65a75d-98fd-4aba-97f1-f24edce85950" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_75512153-6386-4136-8cbc-266b0efc79d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_f879520c-8685-4ecc-aaa1-56d32093a09d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_f879520c-8685-4ecc-aaa1-56d32093a09d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_f879520c-8685-4ecc-aaa1-56d32093a09d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_f879520c-8685-4ecc-aaa1-56d32093a09d" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_f879520c-8685-4ecc-aaa1-56d32093a09d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_cb192d5f-84b3-444b-9ba1-13c61431925b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_f879520c-8685-4ecc-aaa1-56d32093a09d" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_cb192d5f-84b3-444b-9ba1-13c61431925b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMember_effa32d8-8fc6-4c9b-84c9-2b908e24d935" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_cb192d5f-84b3-444b-9ba1-13c61431925b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMember_effa32d8-8fc6-4c9b-84c9-2b908e24d935" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_86e8b35c-de2f-4a92-9924-2927ed139aab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_86e8b35c-de2f-4a92-9924-2927ed139aab" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_86e8b35c-de2f-4a92-9924-2927ed139aab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_86e8b35c-de2f-4a92-9924-2927ed139aab" xlink:to="loc_us-gaap_SegmentDomain_86e8b35c-de2f-4a92-9924-2927ed139aab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b6700134-9512-4c4c-9e98-952b6a7f5fdc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_86e8b35c-de2f-4a92-9924-2927ed139aab" xlink:to="loc_us-gaap_SegmentDomain_b6700134-9512-4c4c-9e98-952b6a7f5fdc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NaturalGasLiquidsSegmentMember_57042b7b-5b06-46a9-828f-af06f81361fc" xlink:href="paa-20221231.xsd#paa_NaturalGasLiquidsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b6700134-9512-4c4c-9e98-952b6a7f5fdc" xlink:to="loc_paa_NaturalGasLiquidsSegmentMember_57042b7b-5b06-46a9-828f-af06f81361fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_021339db-c56d-43da-b6d6-cdb34f24b903" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_f2a216e9-f5ad-466e-86c8-788b681ccdb5" xlink:to="loc_srt_CounterpartyNameAxis_021339db-c56d-43da-b6d6-cdb34f24b903" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_021339db-c56d-43da-b6d6-cdb34f24b903_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_021339db-c56d-43da-b6d6-cdb34f24b903" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_021339db-c56d-43da-b6d6-cdb34f24b903_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_f916ce4b-b672-4e4a-913c-01296c099f2d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_021339db-c56d-43da-b6d6-cdb34f24b903" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_f916ce4b-b672-4e4a-913c-01296c099f2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_FelixEnergyHoldingsIILLCMember_06b4712c-f1ad-4e52-b25d-4a73575a32e1" xlink:href="paa-20221231.xsd#paa_FelixEnergyHoldingsIILLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_f916ce4b-b672-4e4a-913c-01296c099f2d" xlink:to="loc_paa_FelixEnergyHoldingsIILLCMember_06b4712c-f1ad-4e52-b25d-4a73575a32e1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsAssetExchangeDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsAssetExchangeDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsAssetExchangeDetails" xlink:type="extended" id="ie0d50614d31a4c7bae3725465527e372_AcquisitionsDivestituresandOtherTransactionsAssetExchangeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_9f42ba89-1291-44c2-8461-8512ccd1a3cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NumberOfStraddlePlantsAdditionalInterestsAcquired_4fec397e-a603-4451-be37-d2c0b3c69f78" xlink:href="paa-20221231.xsd#paa_NumberOfStraddlePlantsAdditionalInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9f42ba89-1291-44c2-8461-8512ccd1a3cc" xlink:to="loc_paa_NumberOfStraddlePlantsAdditionalInterestsAcquired_4fec397e-a603-4451-be37-d2c0b3c69f78" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_98964a37-5e1e-4c99-9d07-9270f502424e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9f42ba89-1291-44c2-8461-8512ccd1a3cc" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_98964a37-5e1e-4c99-9d07-9270f502424e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_500f2c75-19ae-47c5-a037-ee3427891525" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9f42ba89-1291-44c2-8461-8512ccd1a3cc" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_500f2c75-19ae-47c5-a037-ee3427891525" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fc5b2ffe-33cb-4d87-9f90-e580d6bb2430" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9f42ba89-1291-44c2-8461-8512ccd1a3cc" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fc5b2ffe-33cb-4d87-9f90-e580d6bb2430" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_2a8f2992-b2ca-4788-bfa4-8c2a4e6d7941" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fc5b2ffe-33cb-4d87-9f90-e580d6bb2430" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_2a8f2992-b2ca-4788-bfa4-8c2a4e6d7941" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2a8f2992-b2ca-4788-bfa4-8c2a4e6d7941_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_2a8f2992-b2ca-4788-bfa4-8c2a4e6d7941" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2a8f2992-b2ca-4788-bfa4-8c2a4e6d7941_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d0be3129-5cf3-4b4a-a591-9ba8082df456" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_2a8f2992-b2ca-4788-bfa4-8c2a4e6d7941" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d0be3129-5cf3-4b4a-a591-9ba8082df456" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AdditionalInterestsInStraddlePlantsMember_68a2d7e0-9188-4916-a6a4-b248063ca353" xlink:href="paa-20221231.xsd#paa_AdditionalInterestsInStraddlePlantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_d0be3129-5cf3-4b4a-a591-9ba8082df456" xlink:to="loc_paa_AdditionalInterestsInStraddlePlantsMember_68a2d7e0-9188-4916-a6a4-b248063ca353" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_578d50f2-8c6a-4e7a-b7f8-f6e78b38fab5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fc5b2ffe-33cb-4d87-9f90-e580d6bb2430" xlink:to="loc_srt_CounterpartyNameAxis_578d50f2-8c6a-4e7a-b7f8-f6e78b38fab5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_578d50f2-8c6a-4e7a-b7f8-f6e78b38fab5_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_578d50f2-8c6a-4e7a-b7f8-f6e78b38fab5" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_578d50f2-8c6a-4e7a-b7f8-f6e78b38fab5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_dd442170-8467-49ef-bf26-8632decf95c5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_578d50f2-8c6a-4e7a-b7f8-f6e78b38fab5" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_dd442170-8467-49ef-bf26-8632decf95c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InterPipelineLtdMember_ac68b256-b31f-49d5-b25f-a2a102a7c266" xlink:href="paa-20221231.xsd#paa_InterPipelineLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_dd442170-8467-49ef-bf26-8632decf95c5" xlink:to="loc_paa_InterPipelineLtdMember_ac68b256-b31f-49d5-b25f-a2a102a7c266" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_eabebbad-0c3d-4635-bff4-8afca4b831c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fc5b2ffe-33cb-4d87-9f90-e580d6bb2430" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_eabebbad-0c3d-4635-bff4-8afca4b831c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_eabebbad-0c3d-4635-bff4-8afca4b831c6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_eabebbad-0c3d-4635-bff4-8afca4b831c6" xlink:to="loc_us-gaap_SegmentDomain_eabebbad-0c3d-4635-bff4-8afca4b831c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_449e4f9d-2323-447e-bc3f-f406b8a623a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_eabebbad-0c3d-4635-bff4-8afca4b831c6" xlink:to="loc_us-gaap_SegmentDomain_449e4f9d-2323-447e-bc3f-f406b8a623a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NaturalGasLiquidsSegmentMember_c51e1c42-f36a-492f-8409-6d2af9893a86" xlink:href="paa-20221231.xsd#paa_NaturalGasLiquidsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_449e4f9d-2323-447e-bc3f-f406b8a623a2" xlink:to="loc_paa_NaturalGasLiquidsSegmentMember_c51e1c42-f36a-492f-8409-6d2af9893a86" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_4d0ff168-7807-4dc1-8bd5-9a8f0293a4d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fc5b2ffe-33cb-4d87-9f90-e580d6bb2430" xlink:to="loc_us-gaap_TransactionTypeAxis_4d0ff168-7807-4dc1-8bd5-9a8f0293a4d4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_4d0ff168-7807-4dc1-8bd5-9a8f0293a4d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_4d0ff168-7807-4dc1-8bd5-9a8f0293a4d4" xlink:to="loc_us-gaap_TransactionDomain_4d0ff168-7807-4dc1-8bd5-9a8f0293a4d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_be46dca2-8b3c-472d-8fed-dcbd37ad6124" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_4d0ff168-7807-4dc1-8bd5-9a8f0293a4d4" xlink:to="loc_us-gaap_TransactionDomain_be46dca2-8b3c-472d-8fed-dcbd37ad6124" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AssetExchangeTransactionMember_09374012-a0b2-4e49-96f0-d850443d2447" xlink:href="paa-20221231.xsd#paa_AssetExchangeTransactionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_be46dca2-8b3c-472d-8fed-dcbd37ad6124" xlink:to="loc_paa_AssetExchangeTransactionMember_09374012-a0b2-4e49-96f0-d850443d2447" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_d69fc4cb-3877-4a9b-8233-7262ae892efa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fc5b2ffe-33cb-4d87-9f90-e580d6bb2430" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_d69fc4cb-3877-4a9b-8233-7262ae892efa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_d69fc4cb-3877-4a9b-8233-7262ae892efa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d69fc4cb-3877-4a9b-8233-7262ae892efa" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_d69fc4cb-3877-4a9b-8233-7262ae892efa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_2ec1e47c-3008-41a6-b1b7-3de0a8501d66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d69fc4cb-3877-4a9b-8233-7262ae892efa" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_2ec1e47c-3008-41a6-b1b7-3de0a8501d66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainsLossesOnAssetSalesAndAssetImpairmentsNetMember_17be342e-afa4-4410-bbcb-fb3033e23bf0" xlink:href="paa-20221231.xsd#paa_GainsLossesOnAssetSalesAndAssetImpairmentsNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_2ec1e47c-3008-41a6-b1b7-3de0a8501d66" xlink:to="loc_paa_GainsLossesOnAssetSalesAndAssetImpairmentsNetMember_17be342e-afa4-4410-bbcb-fb3033e23bf0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsJointVentureTransactionDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsJointVentureTransactionDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsJointVentureTransactionDetails" xlink:type="extended" id="i9320179ce24346cfab71aa9d5ec21d46_AcquisitionsDivestituresandOtherTransactionsJointVentureTransactionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest_8ece5c65-e642-4af1-8749-03f590fdbd28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest_8ece5c65-e642-4af1-8749-03f590fdbd28" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b4d5f473-15da-45cc-adbd-ec48d0a8b4ca" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_b4d5f473-15da-45cc-adbd-ec48d0a8b4ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MembersEquity_9c7e76fc-a328-4eb9-9332-1b09e9c484da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MembersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_MembersEquity_9c7e76fc-a328-4eb9-9332-1b09e9c484da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_126226da-12b9-4899-93b5-6257595a737a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_126226da-12b9-4899-93b5-6257595a737a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_80be8111-77be-4092-b213-3cfd9c72d9a0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_80be8111-77be-4092-b213-3cfd9c72d9a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BusinessCombinationMeasurementInput_07286ae1-29d5-4faa-b044-a547a9f6ae5e" xlink:href="paa-20221231.xsd#paa_BusinessCombinationMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_paa_BusinessCombinationMeasurementInput_07286ae1-29d5-4faa-b044-a547a9f6ae5e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_92549471-a356-4c6f-ac87-dd9e278c946f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_92549471-a356-4c6f-ac87-dd9e278c946f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_66b70eec-5258-4cd5-b134-5740ee6a85b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_AdjustmentForAmortization_66b70eec-5258-4cd5-b134-5740ee6a85b9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_796f4fd7-71fe-418e-b943-835c716e073c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_796f4fd7-71fe-418e-b943-835c716e073c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementTerm_80563128-bc55-4037-8869-b12b8215acac" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_paa_ModifiedSharingArrangementTerm_80563128-bc55-4037-8869-b12b8215acac" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DistributionPercentageAfterTerminationOfModifiedSharingArrangement_9a29da28-53c4-4553-9d61-cedf735c3fed" xlink:href="paa-20221231.xsd#paa_DistributionPercentageAfterTerminationOfModifiedSharingArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_paa_DistributionPercentageAfterTerminationOfModifiedSharingArrangement_9a29da28-53c4-4553-9d61-cedf735c3fed" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_31f5e393-7eac-4630-8c48-ac180827d7cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_31f5e393-7eac-4630-8c48-ac180827d7cd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_f7943d92-95fc-4a64-b86f-3afb6f1b415f" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_220d371e-d969-433c-be8c-05a01fdbdbc0" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_srt_OwnershipAxis_220d371e-d969-433c-be8c-05a01fdbdbc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_220d371e-d969-433c-be8c-05a01fdbdbc0_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_220d371e-d969-433c-be8c-05a01fdbdbc0" xlink:to="loc_srt_OwnershipDomain_220d371e-d969-433c-be8c-05a01fdbdbc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_88620ea1-4035-423f-81f7-13c4eacdd3c7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_220d371e-d969-433c-be8c-05a01fdbdbc0" xlink:to="loc_srt_OwnershipDomain_88620ea1-4035-423f-81f7-13c4eacdd3c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_7fc7d203-0f62-4b88-a797-7c47a09a83a8" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_88620ea1-4035-423f-81f7-13c4eacdd3c7" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_7fc7d203-0f62-4b88-a797-7c47a09a83a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAllAmericanPipelineLPMember_ebeaafc8-1351-48ec-9bef-434dd7d37d89" xlink:href="paa-20221231.xsd#paa_PlainsAllAmericanPipelineLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_88620ea1-4035-423f-81f7-13c4eacdd3c7" xlink:to="loc_paa_PlainsAllAmericanPipelineLPMember_ebeaafc8-1351-48ec-9bef-434dd7d37d89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_5984b3cf-0025-46d9-8dfb-77e60a89fbc2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_us-gaap_TransactionTypeAxis_5984b3cf-0025-46d9-8dfb-77e60a89fbc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_5984b3cf-0025-46d9-8dfb-77e60a89fbc2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_5984b3cf-0025-46d9-8dfb-77e60a89fbc2" xlink:to="loc_us-gaap_TransactionDomain_5984b3cf-0025-46d9-8dfb-77e60a89fbc2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_2a10812d-a924-464c-b410-f5815f673ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_5984b3cf-0025-46d9-8dfb-77e60a89fbc2" xlink:to="loc_us-gaap_TransactionDomain_2a10812d-a924-464c-b410-f5815f673ff3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_JointVentureFormationMember_39baecb9-3fa5-42ec-81fc-6269bd687c18" xlink:href="paa-20221231.xsd#paa_JointVentureFormationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_2a10812d-a924-464c-b410-f5815f673ff3" xlink:to="loc_paa_JointVentureFormationMember_39baecb9-3fa5-42ec-81fc-6269bd687c18" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementMember_a71dfa20-ece5-4d04-84c3-4a6229178836" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_2a10812d-a924-464c-b410-f5815f673ff3" xlink:to="loc_paa_ModifiedSharingArrangementMember_a71dfa20-ece5-4d04-84c3-4a6229178836" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_85560173-094e-4cdf-a79b-b09484d3dede" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_srt_CounterpartyNameAxis_85560173-094e-4cdf-a79b-b09484d3dede" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_85560173-094e-4cdf-a79b-b09484d3dede_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_85560173-094e-4cdf-a79b-b09484d3dede" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_85560173-094e-4cdf-a79b-b09484d3dede_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_1ff37e1d-a6df-4d4a-9b8d-5d90061ec596" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_85560173-094e-4cdf-a79b-b09484d3dede" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_1ff37e1d-a6df-4d4a-9b8d-5d90061ec596" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_6238e556-5084-4608-892d-f4f0894cb39e" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_1ff37e1d-a6df-4d4a-9b8d-5d90061ec596" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_6238e556-5084-4608-892d-f4f0894cb39e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_StonepeakInfrastructurePartnersMember_684c6975-587e-4b89-8b4d-1c84b63ccfa0" xlink:href="paa-20221231.xsd#paa_StonepeakInfrastructurePartnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_1ff37e1d-a6df-4d4a-9b8d-5d90061ec596" xlink:to="loc_paa_StonepeakInfrastructurePartnersMember_684c6975-587e-4b89-8b4d-1c84b63ccfa0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_b834d288-e411-414c-b0ac-c7c4c6f25d2d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_b834d288-e411-414c-b0ac-c7c4c6f25d2d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b834d288-e411-414c-b0ac-c7c4c6f25d2d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_b834d288-e411-414c-b0ac-c7c4c6f25d2d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b834d288-e411-414c-b0ac-c7c4c6f25d2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_42005bfd-49df-4288-8dae-65daace854e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_b834d288-e411-414c-b0ac-c7c4c6f25d2d" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_42005bfd-49df-4288-8dae-65daace854e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_c82a9137-df3a-4fea-8da6-5ccaccc8b1af" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_42005bfd-49df-4288-8dae-65daace854e6" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_c82a9137-df3a-4fea-8da6-5ccaccc8b1af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_696e9d65-4c41-46d2-8a89-172e4024360a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_dei_LegalEntityAxis_696e9d65-4c41-46d2-8a89-172e4024360a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_696e9d65-4c41-46d2-8a89-172e4024360a_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_696e9d65-4c41-46d2-8a89-172e4024360a" xlink:to="loc_dei_EntityDomain_696e9d65-4c41-46d2-8a89-172e4024360a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_78102056-9398-4974-9949-13f27533a61a" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_696e9d65-4c41-46d2-8a89-172e4024360a" xlink:to="loc_dei_EntityDomain_78102056-9398-4974-9949-13f27533a61a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_3ea03a86-626a-4a7c-9e6f-2492ef568b7a" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_78102056-9398-4974-9949-13f27533a61a" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_3ea03a86-626a-4a7c-9e6f-2492ef568b7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_StonepeakInfrastructurePartnersAffiliatesMember_f48ef868-840c-4e9a-a444-c03d0be4487b" xlink:href="paa-20221231.xsd#paa_StonepeakInfrastructurePartnersAffiliatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_78102056-9398-4974-9949-13f27533a61a" xlink:to="loc_paa_StonepeakInfrastructurePartnersAffiliatesMember_f48ef868-840c-4e9a-a444-c03d0be4487b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_35fa657b-1b08-41b6-b621-936db6e4e1eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_35fa657b-1b08-41b6-b621-936db6e4e1eb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_35fa657b-1b08-41b6-b621-936db6e4e1eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_35fa657b-1b08-41b6-b621-936db6e4e1eb" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_35fa657b-1b08-41b6-b621-936db6e4e1eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_18267999-c717-4f52-a61c-a0115f00dd81" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_35fa657b-1b08-41b6-b621-936db6e4e1eb" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_18267999-c717-4f52-a61c-a0115f00dd81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_b5c52e5b-d9d0-4a92-a940-e6da215d66f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_18267999-c717-4f52-a61c-a0115f00dd81" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_b5c52e5b-d9d0-4a92-a940-e6da215d66f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_819a2e13-123a-4464-ad01-5ece1550f30f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_819a2e13-123a-4464-ad01-5ece1550f30f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_819a2e13-123a-4464-ad01-5ece1550f30f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_819a2e13-123a-4464-ad01-5ece1550f30f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_819a2e13-123a-4464-ad01-5ece1550f30f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_80b9d10c-f9c1-487c-9ba2-03d75e3dbe24" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_819a2e13-123a-4464-ad01-5ece1550f30f" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_80b9d10c-f9c1-487c-9ba2-03d75e3dbe24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_c87a3dee-7a0b-4e88-8f17-9dbbd7bf634e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_80b9d10c-f9c1-487c-9ba2-03d75e3dbe24" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_c87a3dee-7a0b-4e88-8f17-9dbbd7bf634e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_MeasurementInputMarketMultipleMember_9c95cf09-b2df-4cc8-8402-85f0055c1eb0" xlink:href="paa-20221231.xsd#paa_MeasurementInputMarketMultipleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_80b9d10c-f9c1-487c-9ba2-03d75e3dbe24" xlink:to="loc_paa_MeasurementInputMarketMultipleMember_9c95cf09-b2df-4cc8-8402-85f0055c1eb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_601f1d19-e297-4863-82e4-a5c3315e40eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_us-gaap_ValuationTechniqueAxis_601f1d19-e297-4863-82e4-a5c3315e40eb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_601f1d19-e297-4863-82e4-a5c3315e40eb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_601f1d19-e297-4863-82e4-a5c3315e40eb" xlink:to="loc_us-gaap_ValuationTechniqueDomain_601f1d19-e297-4863-82e4-a5c3315e40eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_2e247de7-3c9f-4bdd-939f-670ac61c8551" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_601f1d19-e297-4863-82e4-a5c3315e40eb" xlink:to="loc_us-gaap_ValuationTechniqueDomain_2e247de7-3c9f-4bdd-939f-670ac61c8551" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_b1dfaac6-80d5-4189-9de8-b2d970d6e145" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_2e247de7-3c9f-4bdd-939f-670ac61c8551" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_b1dfaac6-80d5-4189-9de8-b2d970d6e145" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketApproachValuationTechniqueMember_3dd4d04b-bbb9-4b8b-84bc-b9bfb572693b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MarketApproachValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_2e247de7-3c9f-4bdd-939f-670ac61c8551" xlink:to="loc_us-gaap_MarketApproachValuationTechniqueMember_3dd4d04b-bbb9-4b8b-84bc-b9bfb572693b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_13856ad0-955c-4f20-be65-a6b23fafcf21" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_srt_RangeAxis_13856ad0-955c-4f20-be65-a6b23fafcf21" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_13856ad0-955c-4f20-be65-a6b23fafcf21_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_13856ad0-955c-4f20-be65-a6b23fafcf21" xlink:to="loc_srt_RangeMember_13856ad0-955c-4f20-be65-a6b23fafcf21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_90a8bb26-11a7-48db-a14a-57d853f83147" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_13856ad0-955c-4f20-be65-a6b23fafcf21" xlink:to="loc_srt_RangeMember_90a8bb26-11a7-48db-a14a-57d853f83147" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_10426c01-4b58-440e-afc5-e5fbf61eaa3b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_90a8bb26-11a7-48db-a14a-57d853f83147" xlink:to="loc_srt_MinimumMember_10426c01-4b58-440e-afc5-e5fbf61eaa3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_eb4ca837-d1be-4e39-ad79-c73baa147b4b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_90a8bb26-11a7-48db-a14a-57d853f83147" xlink:to="loc_srt_MaximumMember_eb4ca837-d1be-4e39-ad79-c73baa147b4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_cc556bf5-3506-4d2f-b15f-7760e7a7de00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_cc556bf5-3506-4d2f-b15f-7760e7a7de00" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_cc556bf5-3506-4d2f-b15f-7760e7a7de00_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_cc556bf5-3506-4d2f-b15f-7760e7a7de00" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_cc556bf5-3506-4d2f-b15f-7760e7a7de00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_b57923e2-b8c5-4763-93f9-22fe6030f76c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_cc556bf5-3506-4d2f-b15f-7760e7a7de00" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_b57923e2-b8c5-4763-93f9-22fe6030f76c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMember_3c46ac45-5649-4e9f-a9a5-e297b669a78a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_b57923e2-b8c5-4763-93f9-22fe6030f76c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMember_3c46ac45-5649-4e9f-a9a5-e297b669a78a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_965b5b3a-c5f7-4826-839b-539ec2d7c671" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_965b5b3a-c5f7-4826-839b-539ec2d7c671" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_965b5b3a-c5f7-4826-839b-539ec2d7c671_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_965b5b3a-c5f7-4826-839b-539ec2d7c671" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_965b5b3a-c5f7-4826-839b-539ec2d7c671_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_be006d25-7ebf-4207-99f4-73f81f484966" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_965b5b3a-c5f7-4826-839b-539ec2d7c671" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_be006d25-7ebf-4207-99f4-73f81f484966" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_17e97766-d489-46a1-a20c-88957cc18e61" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_be006d25-7ebf-4207-99f4-73f81f484966" xlink:to="loc_us-gaap_CustomerRelationshipsMember_17e97766-d489-46a1-a20c-88957cc18e61" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_5878445b-b3d2-49af-b891-c6447f59b44b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3d10c98a-97c4-4682-85cb-7988e7152947" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_5878445b-b3d2-49af-b891-c6447f59b44b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_5878445b-b3d2-49af-b891-c6447f59b44b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_5878445b-b3d2-49af-b891-c6447f59b44b" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_5878445b-b3d2-49af-b891-c6447f59b44b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_da2c8ab9-e2a0-4ac7-9e9c-ebc51eeeb6eb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_5878445b-b3d2-49af-b891-c6447f59b44b" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_da2c8ab9-e2a0-4ac7-9e9c-ebc51eeeb6eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_924e0aa3-b6c3-40ef-aad0-42aad1f5ed98" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_da2c8ab9-e2a0-4ac7-9e9c-ebc51eeeb6eb" xlink:to="loc_paa_SeriesAPreferredUnitsMember_924e0aa3-b6c3-40ef-aad0-42aad1f5ed98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnerMember_7d4df1bd-d91a-441d-bc3a-5fcea7aed8c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_da2c8ab9-e2a0-4ac7-9e9c-ebc51eeeb6eb" xlink:to="loc_us-gaap_LimitedPartnerMember_7d4df1bd-d91a-441d-bc3a-5fcea7aed8c4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsPartnersCapitalDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsPartnersCapitalDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsPartnersCapitalDetails" xlink:type="extended" id="i55764c837e2349e0b9ef7788f7b5024a_AcquisitionsDivestituresandOtherTransactionsPartnersCapitalDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_46a8b3c1-5cd1-4fbb-8ebe-faa845d6b4ee" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_c0389663-4257-4504-88ce-476faeb13acf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46a8b3c1-5cd1-4fbb-8ebe-faa845d6b4ee" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_c0389663-4257-4504-88ce-476faeb13acf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountAcquisitions_8e4f783a-284e-4d41-a43f-1541cad4532b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46a8b3c1-5cd1-4fbb-8ebe-faa845d6b4ee" xlink:to="loc_us-gaap_PartnersCapitalAccountAcquisitions_8e4f783a-284e-4d41-a43f-1541cad4532b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_0c6b965a-5864-49eb-a47e-8eeff3896627" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46a8b3c1-5cd1-4fbb-8ebe-faa845d6b4ee" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_0c6b965a-5864-49eb-a47e-8eeff3896627" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3d2f2cf0-23b0-4791-bdfd-66710125a30f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_0c6b965a-5864-49eb-a47e-8eeff3896627" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3d2f2cf0-23b0-4791-bdfd-66710125a30f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d2f2cf0-23b0-4791-bdfd-66710125a30f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3d2f2cf0-23b0-4791-bdfd-66710125a30f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d2f2cf0-23b0-4791-bdfd-66710125a30f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b1b39f17-6395-4fb6-ae82-d3b369749031" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3d2f2cf0-23b0-4791-bdfd-66710125a30f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b1b39f17-6395-4fb6-ae82-d3b369749031" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_72245420-125e-41d7-b979-a469707a42bc" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b1b39f17-6395-4fb6-ae82-d3b369749031" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_72245420-125e-41d7-b979-a469707a42bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_bdba18ee-b07c-4790-8903-b82e529c14d0" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_0c6b965a-5864-49eb-a47e-8eeff3896627" xlink:to="loc_srt_CounterpartyNameAxis_bdba18ee-b07c-4790-8903-b82e529c14d0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_bdba18ee-b07c-4790-8903-b82e529c14d0_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_bdba18ee-b07c-4790-8903-b82e529c14d0" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_bdba18ee-b07c-4790-8903-b82e529c14d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_b58a33cf-4cbf-445f-a643-f48515e40ff7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_bdba18ee-b07c-4790-8903-b82e529c14d0" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_b58a33cf-4cbf-445f-a643-f48515e40ff7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_4aa6f470-7811-457c-af4c-61e3fa79d9d6" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_b58a33cf-4cbf-445f-a643-f48515e40ff7" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_4aa6f470-7811-457c-af4c-61e3fa79d9d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_55f20c56-e46b-415f-b323-b6d89c91fba2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_0c6b965a-5864-49eb-a47e-8eeff3896627" xlink:to="loc_us-gaap_TransactionTypeAxis_55f20c56-e46b-415f-b323-b6d89c91fba2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_55f20c56-e46b-415f-b323-b6d89c91fba2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_55f20c56-e46b-415f-b323-b6d89c91fba2" xlink:to="loc_us-gaap_TransactionDomain_55f20c56-e46b-415f-b323-b6d89c91fba2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_c003e2b6-46f0-408e-808e-6e60a68725e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_55f20c56-e46b-415f-b323-b6d89c91fba2" xlink:to="loc_us-gaap_TransactionDomain_c003e2b6-46f0-408e-808e-6e60a68725e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_JointVentureFormationMember_0c57c193-cbe9-4772-9268-2a0d78959524" xlink:href="paa-20221231.xsd#paa_JointVentureFormationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_c003e2b6-46f0-408e-808e-6e60a68725e2" xlink:to="loc_paa_JointVentureFormationMember_0c57c193-cbe9-4772-9268-2a0d78959524" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_5f1b5b2d-77c0-4799-9932-ffdfba750e85" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_0c6b965a-5864-49eb-a47e-8eeff3896627" xlink:to="loc_dei_LegalEntityAxis_5f1b5b2d-77c0-4799-9932-ffdfba750e85" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5f1b5b2d-77c0-4799-9932-ffdfba750e85_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_5f1b5b2d-77c0-4799-9932-ffdfba750e85" xlink:to="loc_dei_EntityDomain_5f1b5b2d-77c0-4799-9932-ffdfba750e85_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_054440ea-7a4e-41b0-ab97-de6686e49396" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_5f1b5b2d-77c0-4799-9932-ffdfba750e85" xlink:to="loc_dei_EntityDomain_054440ea-7a4e-41b0-ab97-de6686e49396" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_71fb2c89-005a-46b0-9ada-6d8ed5a963b9" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_054440ea-7a4e-41b0-ab97-de6686e49396" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_71fb2c89-005a-46b0-9ada-6d8ed5a963b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_3265c235-08d9-497b-94aa-52e2fdc49216" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_0c6b965a-5864-49eb-a47e-8eeff3896627" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_3265c235-08d9-497b-94aa-52e2fdc49216" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_3265c235-08d9-497b-94aa-52e2fdc49216_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_3265c235-08d9-497b-94aa-52e2fdc49216" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_3265c235-08d9-497b-94aa-52e2fdc49216_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_220efb9c-344a-4f24-ae84-b2b752716cdf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_3265c235-08d9-497b-94aa-52e2fdc49216" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_220efb9c-344a-4f24-ae84-b2b752716cdf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_87deaf1f-b604-466e-a7fe-988b40e9896b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_220efb9c-344a-4f24-ae84-b2b752716cdf" xlink:to="loc_us-gaap_NoncontrollingInterestMember_87deaf1f-b604-466e-a7fe-988b40e9896b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_eaf72e86-d666-4416-8774-95bde23c25c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_220efb9c-344a-4f24-ae84-b2b752716cdf" xlink:to="loc_us-gaap_ParentMember_eaf72e86-d666-4416-8774-95bde23c25c6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsModifiedSharingArrangementDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsModifiedSharingArrangementDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsModifiedSharingArrangementDetails" xlink:type="extended" id="i9936d6b4c0f54f01856d20f49360c627_AcquisitionsDivestituresandOtherTransactionsModifiedSharingArrangementDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_84d1672b-8c5c-4f85-a76d-580411db52b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementDistributionPercentage_8d03e218-193d-4933-85a6-5d0acd3b037d" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementDistributionPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_84d1672b-8c5c-4f85-a76d-580411db52b7" xlink:to="loc_paa_ModifiedSharingArrangementDistributionPercentage_8d03e218-193d-4933-85a6-5d0acd3b037d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e2c40c27-7967-412d-958b-b6cea50ec224" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_84d1672b-8c5c-4f85-a76d-580411db52b7" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e2c40c27-7967-412d-958b-b6cea50ec224" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_84a37a79-9261-4ae8-a7e2-0912c13cbfea" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e2c40c27-7967-412d-958b-b6cea50ec224" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_84a37a79-9261-4ae8-a7e2-0912c13cbfea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_84a37a79-9261-4ae8-a7e2-0912c13cbfea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_84a37a79-9261-4ae8-a7e2-0912c13cbfea" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_84a37a79-9261-4ae8-a7e2-0912c13cbfea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fe0f1313-9cb6-4164-9b3e-115c801d0f49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_84a37a79-9261-4ae8-a7e2-0912c13cbfea" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fe0f1313-9cb6-4164-9b3e-115c801d0f49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_a2506893-a28b-45bf-ba75-179b8df98562" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_fe0f1313-9cb6-4164-9b3e-115c801d0f49" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_a2506893-a28b-45bf-ba75-179b8df98562" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_026a6322-4583-4d10-9df5-09703d6864dc" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e2c40c27-7967-412d-958b-b6cea50ec224" xlink:to="loc_dei_LegalEntityAxis_026a6322-4583-4d10-9df5-09703d6864dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_026a6322-4583-4d10-9df5-09703d6864dc_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_026a6322-4583-4d10-9df5-09703d6864dc" xlink:to="loc_dei_EntityDomain_026a6322-4583-4d10-9df5-09703d6864dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_385efb05-afe7-4361-af88-b0a25fe1b151" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_026a6322-4583-4d10-9df5-09703d6864dc" xlink:to="loc_dei_EntityDomain_385efb05-afe7-4361-af88-b0a25fe1b151" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_0379dfed-e9e3-4912-9d4e-8a6ba2dcd620" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_385efb05-afe7-4361-af88-b0a25fe1b151" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_0379dfed-e9e3-4912-9d4e-8a6ba2dcd620" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_2c4e511d-8dbe-4767-a872-8a9c27129e38" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e2c40c27-7967-412d-958b-b6cea50ec224" xlink:to="loc_us-gaap_TransactionTypeAxis_2c4e511d-8dbe-4767-a872-8a9c27129e38" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_2c4e511d-8dbe-4767-a872-8a9c27129e38_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_2c4e511d-8dbe-4767-a872-8a9c27129e38" xlink:to="loc_us-gaap_TransactionDomain_2c4e511d-8dbe-4767-a872-8a9c27129e38_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_85b8474c-ccf0-44d5-8b9a-9228d00f6730" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_2c4e511d-8dbe-4767-a872-8a9c27129e38" xlink:to="loc_us-gaap_TransactionDomain_85b8474c-ccf0-44d5-8b9a-9228d00f6730" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementMember_1555eb57-47f0-4ed0-9010-db17cba1fc58" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_85b8474c-ccf0-44d5-8b9a-9228d00f6730" xlink:to="loc_paa_ModifiedSharingArrangementMember_1555eb57-47f0-4ed0-9010-db17cba1fc58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementAnnualAvailableCashAxis_2d835058-0cd1-4239-9a38-23d34be119ff" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementAnnualAvailableCashAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_e2c40c27-7967-412d-958b-b6cea50ec224" xlink:to="loc_paa_ModifiedSharingArrangementAnnualAvailableCashAxis_2d835058-0cd1-4239-9a38-23d34be119ff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementAnnualAvailableCashDomain_2d835058-0cd1-4239-9a38-23d34be119ff_default" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementAnnualAvailableCashDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_paa_ModifiedSharingArrangementAnnualAvailableCashAxis_2d835058-0cd1-4239-9a38-23d34be119ff" xlink:to="loc_paa_ModifiedSharingArrangementAnnualAvailableCashDomain_2d835058-0cd1-4239-9a38-23d34be119ff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementAnnualAvailableCashDomain_6ceede57-54a1-4310-8b17-5f5974087909" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementAnnualAvailableCashDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_paa_ModifiedSharingArrangementAnnualAvailableCashAxis_2d835058-0cd1-4239-9a38-23d34be119ff" xlink:to="loc_paa_ModifiedSharingArrangementAnnualAvailableCashDomain_6ceede57-54a1-4310-8b17-5f5974087909" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementAnnualAvailableCashUpTo300MillionMember_97ceef4e-1478-45b7-9a05-32680a52aca6" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementAnnualAvailableCashUpTo300MillionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ModifiedSharingArrangementAnnualAvailableCashDomain_6ceede57-54a1-4310-8b17-5f5974087909" xlink:to="loc_paa_ModifiedSharingArrangementAnnualAvailableCashUpTo300MillionMember_97ceef4e-1478-45b7-9a05-32680a52aca6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementAnnualAvailableCashBetween300MillionTo428MillionMember_91c888c7-740d-4f5a-b7d6-e031f22aff0f" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementAnnualAvailableCashBetween300MillionTo428MillionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ModifiedSharingArrangementAnnualAvailableCashDomain_6ceede57-54a1-4310-8b17-5f5974087909" xlink:to="loc_paa_ModifiedSharingArrangementAnnualAvailableCashBetween300MillionTo428MillionMember_91c888c7-740d-4f5a-b7d6-e031f22aff0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedRevenueArrangementAnnualAvailableCashBetween428MillionTo815MillionMember_ae26ff98-06f4-4b5b-83c2-fb7b1ee8a1eb" xlink:href="paa-20221231.xsd#paa_ModifiedRevenueArrangementAnnualAvailableCashBetween428MillionTo815MillionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ModifiedSharingArrangementAnnualAvailableCashDomain_6ceede57-54a1-4310-8b17-5f5974087909" xlink:to="loc_paa_ModifiedRevenueArrangementAnnualAvailableCashBetween428MillionTo815MillionMember_ae26ff98-06f4-4b5b-83c2-fb7b1ee8a1eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ModifiedSharingArrangementAnnualAvailableCash815MillionAndAboveMember_bb86c1eb-d966-4168-b76d-e56c06088fdb" xlink:href="paa-20221231.xsd#paa_ModifiedSharingArrangementAnnualAvailableCash815MillionAndAboveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ModifiedSharingArrangementAnnualAvailableCashDomain_6ceede57-54a1-4310-8b17-5f5974087909" xlink:to="loc_paa_ModifiedSharingArrangementAnnualAvailableCash815MillionAndAboveMember_bb86c1eb-d966-4168-b76d-e56c06088fdb" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsProFormaDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsProFormaDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsProFormaDetails" xlink:type="extended" id="i62dbecc2161e4a81af18ba9969e0bb07_AcquisitionsDivestituresandOtherTransactionsProFormaDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_46680e88-190b-4ed2-8a69-bf73d6df87f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_9f8e5237-3352-45d8-b486-1bfc92846185" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46680e88-190b-4ed2-8a69-bf73d6df87f7" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_9f8e5237-3352-45d8-b486-1bfc92846185" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BusinessCombinationProFormaNetIncomeLossAttributableToTheParent_c42750ae-4629-4615-9461-65e77cbc0001" xlink:href="paa-20221231.xsd#paa_BusinessCombinationProFormaNetIncomeLossAttributableToTheParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46680e88-190b-4ed2-8a69-bf73d6df87f7" xlink:to="loc_paa_BusinessCombinationProFormaNetIncomeLossAttributableToTheParent_c42750ae-4629-4615-9461-65e77cbc0001" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BusinessAcquisitionProFormaNetIncomeLossAllocatedToCommonUnitholdersBasic_83490a75-67e4-4e92-aafe-1ab11502e489" xlink:href="paa-20221231.xsd#paa_BusinessAcquisitionProFormaNetIncomeLossAllocatedToCommonUnitholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46680e88-190b-4ed2-8a69-bf73d6df87f7" xlink:to="loc_paa_BusinessAcquisitionProFormaNetIncomeLossAllocatedToCommonUnitholdersBasic_83490a75-67e4-4e92-aafe-1ab11502e489" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_3d4e308f-4abd-4b4e-a998-f040a336a0e0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46680e88-190b-4ed2-8a69-bf73d6df87f7" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic_3d4e308f-4abd-4b4e-a998-f040a336a0e0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_f64e4678-071f-41e1-b2db-5a70faeb50ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46680e88-190b-4ed2-8a69-bf73d6df87f7" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted_f64e4678-071f-41e1-b2db-5a70faeb50ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fb249331-4eee-4570-b582-2a546d938953" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_46680e88-190b-4ed2-8a69-bf73d6df87f7" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fb249331-4eee-4570-b582-2a546d938953" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_ffc54647-e9c9-43df-8f08-3543908ec8a0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fb249331-4eee-4570-b582-2a546d938953" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_ffc54647-e9c9-43df-8f08-3543908ec8a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ffc54647-e9c9-43df-8f08-3543908ec8a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_ffc54647-e9c9-43df-8f08-3543908ec8a0" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ffc54647-e9c9-43df-8f08-3543908ec8a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_40968df5-58d3-4ae1-9849-21a4d84320ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_ffc54647-e9c9-43df-8f08-3543908ec8a0" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_40968df5-58d3-4ae1-9849-21a4d84320ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_2d7c34ed-0b54-4582-9995-d93d7ed1037b" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_40968df5-58d3-4ae1-9849-21a4d84320ce" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_2d7c34ed-0b54-4582-9995-d93d7ed1037b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_8fcbbd34-07cd-4ba7-b302-9da1501895fa" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fb249331-4eee-4570-b582-2a546d938953" xlink:to="loc_srt_CounterpartyNameAxis_8fcbbd34-07cd-4ba7-b302-9da1501895fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_8fcbbd34-07cd-4ba7-b302-9da1501895fa_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_8fcbbd34-07cd-4ba7-b302-9da1501895fa" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_8fcbbd34-07cd-4ba7-b302-9da1501895fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_349bd26c-9008-4811-b20a-ad005d9e39a9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_8fcbbd34-07cd-4ba7-b302-9da1501895fa" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_349bd26c-9008-4811-b20a-ad005d9e39a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_b54d1e27-34ce-486a-88d1-ecf4cb6261dd" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_349bd26c-9008-4811-b20a-ad005d9e39a9" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_b54d1e27-34ce-486a-88d1-ecf4cb6261dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_34bf625e-0d34-4c21-9ac6-2aae4d789c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_fb249331-4eee-4570-b582-2a546d938953" xlink:to="loc_us-gaap_TransactionTypeAxis_34bf625e-0d34-4c21-9ac6-2aae4d789c5a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_34bf625e-0d34-4c21-9ac6-2aae4d789c5a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_34bf625e-0d34-4c21-9ac6-2aae4d789c5a" xlink:to="loc_us-gaap_TransactionDomain_34bf625e-0d34-4c21-9ac6-2aae4d789c5a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_a34e0b34-538a-4196-acff-a937e0aa870a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_34bf625e-0d34-4c21-9ac6-2aae4d789c5a" xlink:to="loc_us-gaap_TransactionDomain_a34e0b34-538a-4196-acff-a937e0aa870a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_JointVentureFormationMember_3b599122-31b8-418a-a224-0a1de63d3116" xlink:href="paa-20221231.xsd#paa_JointVentureFormationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_a34e0b34-538a-4196-acff-a937e0aa870a" xlink:to="loc_paa_JointVentureFormationMember_3b599122-31b8-418a-a224-0a1de63d3116" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsDivestituresDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsDivestituresDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsDivestituresDetails" xlink:type="extended" id="i012f4708a0854b90a1b20e3e4f4e18fe_AcquisitionsDivestituresandOtherTransactionsDivestituresDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_7355c138-acaa-4d6a-9f29-864328770ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfProductiveAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_ProceedsFromSaleOfProductiveAssets_7355c138-acaa-4d6a-9f29-864328770ef0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_e2692e90-9987-4fab-965b-30128e97acf7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_e2692e90-9987-4fab-965b-30128e97acf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_bd37aca0-bce1-41f2-b87a-6432dc612485" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent_bd37aca0-bce1-41f2-b87a-6432dc612485" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_3f2d22cf-4ba5-4fa7-a110-b68dc03cebd0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_PartnersCapital_3f2d22cf-4ba5-4fa7-a110-b68dc03cebd0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_d1c27104-14fd-4001-a577-704572ca9fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_d1c27104-14fd-4001-a577-704572ca9fb9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ProceedsFromSaleOfProductiveAssetsAndAgreements_7ae651da-1c5d-4c31-975d-bd7e90e415d0" xlink:href="paa-20221231.xsd#paa_ProceedsFromSaleOfProductiveAssetsAndAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_paa_ProceedsFromSaleOfProductiveAssetsAndAgreements_7ae651da-1c5d-4c31-975d-bd7e90e415d0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_c8be1f32-38d5-4ab2-91cf-72a15fadd153" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInDeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_IncreaseDecreaseInDeferredRevenue_c8be1f32-38d5-4ab2-91cf-72a15fadd153" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityMethodInvestmentOwnershipPercentageSold_02087ecb-5886-46f9-8e68-3f267a730865" xlink:href="paa-20221231.xsd#paa_EquityMethodInvestmentOwnershipPercentageSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_paa_EquityMethodInvestmentOwnershipPercentageSold_02087ecb-5886-46f9-8e68-3f267a730865" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_21c015a5-8e8e-47b3-88ed-5effcdfff002" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_21c015a5-8e8e-47b3-88ed-5effcdfff002" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_b951a558-b895-4e27-8e63-bffb8a3cd86b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_b951a558-b895-4e27-8e63-bffb8a3cd86b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_43623c6c-7a9c-48cd-8e12-b9050fe6e895" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_4cbb6816-6037-44b5-8701-225b54a05daf" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_43623c6c-7a9c-48cd-8e12-b9050fe6e895" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_f8bbff06-4beb-428a-b53d-aff51317931c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_43623c6c-7a9c-48cd-8e12-b9050fe6e895" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_f8bbff06-4beb-428a-b53d-aff51317931c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_f8bbff06-4beb-428a-b53d-aff51317931c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f8bbff06-4beb-428a-b53d-aff51317931c" xlink:to="loc_us-gaap_SegmentDomain_f8bbff06-4beb-428a-b53d-aff51317931c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_04cc76a7-1d28-43aa-b2f3-9e34052d8c2b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_f8bbff06-4beb-428a-b53d-aff51317931c" xlink:to="loc_us-gaap_SegmentDomain_04cc76a7-1d28-43aa-b2f3-9e34052d8c2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilSegmentMember_6bf78af0-6a7c-41a0-93a5-dedee684ea6c" xlink:href="paa-20221231.xsd#paa_CrudeOilSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_04cc76a7-1d28-43aa-b2f3-9e34052d8c2b" xlink:to="loc_paa_CrudeOilSegmentMember_6bf78af0-6a7c-41a0-93a5-dedee684ea6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NaturalGasLiquidsSegmentMember_9b9ebdbb-8cdc-4ee4-995d-101296821543" xlink:href="paa-20221231.xsd#paa_NaturalGasLiquidsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_04cc76a7-1d28-43aa-b2f3-9e34052d8c2b" xlink:to="loc_paa_NaturalGasLiquidsSegmentMember_9b9ebdbb-8cdc-4ee4-995d-101296821543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_e0a95789-b7a7-41c6-b24c-72f030aa8e94" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_43623c6c-7a9c-48cd-8e12-b9050fe6e895" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_e0a95789-b7a7-41c6-b24c-72f030aa8e94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_e0a95789-b7a7-41c6-b24c-72f030aa8e94_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_e0a95789-b7a7-41c6-b24c-72f030aa8e94" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_e0a95789-b7a7-41c6-b24c-72f030aa8e94_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5c3ac661-9cbf-46d7-840d-7bf6e73d46a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_e0a95789-b7a7-41c6-b24c-72f030aa8e94" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5c3ac661-9cbf-46d7-840d-7bf6e73d46a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AssetsSoldPrimarilyConsistedOfLandAndRelatedAssetsInLongBeachCaliforniaAsWellAsLine901AndTheSisquocToPentlandPortionOfLine903Member_1f921fab-7d1f-4691-b4df-7c0b767a89c3" xlink:href="paa-20221231.xsd#paa_AssetsSoldPrimarilyConsistedOfLandAndRelatedAssetsInLongBeachCaliforniaAsWellAsLine901AndTheSisquocToPentlandPortionOfLine903Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5c3ac661-9cbf-46d7-840d-7bf6e73d46a5" xlink:to="loc_paa_AssetsSoldPrimarilyConsistedOfLandAndRelatedAssetsInLongBeachCaliforniaAsWellAsLine901AndTheSisquocToPentlandPortionOfLine903Member_1f921fab-7d1f-4691-b4df-7c0b767a89c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PinePrairieAndSouthernPinesNaturalGasStorageFacilitiesMember_9c53eb26-a01a-4552-be80-d3b019890129" xlink:href="paa-20221231.xsd#paa_PinePrairieAndSouthernPinesNaturalGasStorageFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5c3ac661-9cbf-46d7-840d-7bf6e73d46a5" xlink:to="loc_paa_PinePrairieAndSouthernPinesNaturalGasStorageFacilitiesMember_9c53eb26-a01a-4552-be80-d3b019890129" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LosAngelesBasinCrudeOilTerminalsMember_311f9248-b2f5-445f-b2c7-1e6d15ec1344" xlink:href="paa-20221231.xsd#paa_LosAngelesBasinCrudeOilTerminalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5c3ac661-9cbf-46d7-840d-7bf6e73d46a5" xlink:to="loc_paa_LosAngelesBasinCrudeOilTerminalsMember_311f9248-b2f5-445f-b2c7-1e6d15ec1344" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NGLTerminalsMember_bc2790ff-91fd-4fa4-8f01-61d7f7266e71" xlink:href="paa-20221231.xsd#paa_NGLTerminalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_5c3ac661-9cbf-46d7-840d-7bf6e73d46a5" xlink:to="loc_paa_NGLTerminalsMember_bc2790ff-91fd-4fa4-8f01-61d7f7266e71" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_2536d294-7f05-48a6-b3ce-8c5df8117b8d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_43623c6c-7a9c-48cd-8e12-b9050fe6e895" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_2536d294-7f05-48a6-b3ce-8c5df8117b8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_2536d294-7f05-48a6-b3ce-8c5df8117b8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_2536d294-7f05-48a6-b3ce-8c5df8117b8d" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_2536d294-7f05-48a6-b3ce-8c5df8117b8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_c8ad999b-132c-4011-928f-1735ea982a84" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_2536d294-7f05-48a6-b3ce-8c5df8117b8d" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_c8ad999b-132c-4011-928f-1735ea982a84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_4affab7d-07af-4afa-8378-e7a59e518c7e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_c8ad999b-132c-4011-928f-1735ea982a84" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_4affab7d-07af-4afa-8378-e7a59e518c7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_513c11d1-9fee-4022-99d7-4f61607da297" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_c8ad999b-132c-4011-928f-1735ea982a84" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_513c11d1-9fee-4022-99d7-4f61607da297" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_9fd61b32-4a7c-4b7d-b705-5c8643f72feb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_43623c6c-7a9c-48cd-8e12-b9050fe6e895" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_9fd61b32-4a7c-4b7d-b705-5c8643f72feb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_9fd61b32-4a7c-4b7d-b705-5c8643f72feb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_9fd61b32-4a7c-4b7d-b705-5c8643f72feb" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_9fd61b32-4a7c-4b7d-b705-5c8643f72feb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_910c8d3d-370e-4af7-b0ca-aa6f4cb3b7ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_9fd61b32-4a7c-4b7d-b705-5c8643f72feb" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_910c8d3d-370e-4af7-b0ca-aa6f4cb3b7ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_9a9ef699-96d0-4f56-888e-94c3c732beda" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_910c8d3d-370e-4af7-b0ca-aa6f4cb3b7ae" xlink:to="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_9a9ef699-96d0-4f56-888e-94c3c732beda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_d5f2388e-436a-4e9e-89b1-2e580a34f54f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_43623c6c-7a9c-48cd-8e12-b9050fe6e895" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_d5f2388e-436a-4e9e-89b1-2e580a34f54f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_d5f2388e-436a-4e9e-89b1-2e580a34f54f_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_d5f2388e-436a-4e9e-89b1-2e580a34f54f" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_d5f2388e-436a-4e9e-89b1-2e580a34f54f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_2d18070a-b389-480f-a02e-3cb1a352e16b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_d5f2388e-436a-4e9e-89b1-2e580a34f54f" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_2d18070a-b389-480f-a02e-3cb1a352e16b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SaddlehornPipelineCompanyLLCMember_c6a96040-07bd-4310-9a19-4b2822f71648" xlink:href="paa-20221231.xsd#paa_SaddlehornPipelineCompanyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_2d18070a-b389-480f-a02e-3cb1a352e16b" xlink:to="loc_paa_SaddlehornPipelineCompanyLLCMember_c6a96040-07bd-4310-9a19-4b2822f71648" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_f164ade6-d6ae-47aa-a527-1ed08e7e2116" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_43623c6c-7a9c-48cd-8e12-b9050fe6e895" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_f164ade6-d6ae-47aa-a527-1ed08e7e2116" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_f164ade6-d6ae-47aa-a527-1ed08e7e2116_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_f164ade6-d6ae-47aa-a527-1ed08e7e2116" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_f164ade6-d6ae-47aa-a527-1ed08e7e2116_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_6b8e23ff-1879-496a-be63-d9e382d954af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_f164ade6-d6ae-47aa-a527-1ed08e7e2116" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_6b8e23ff-1879-496a-be63-d9e382d954af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainsLossesOnAssetSalesAndAssetImpairmentsNetMember_24e84c2b-c7da-4c88-a3fd-9c073c3f8d02" xlink:href="paa-20221231.xsd#paa_GainsLossesOnAssetSalesAndAssetImpairmentsNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_6b8e23ff-1879-496a-be63-d9e382d954af" xlink:to="loc_paa_GainsLossesOnAssetSalesAndAssetImpairmentsNetMember_24e84c2b-c7da-4c88-a3fd-9c073c3f8d02" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsAssetsHeldforSaleDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#AcquisitionsDivestituresandOtherTransactionsAssetsHeldforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/AcquisitionsDivestituresandOtherTransactionsAssetsHeldforSaleDetails" xlink:type="extended" id="i2f4767e724b7443d924210109d461054_AcquisitionsDivestituresandOtherTransactionsAssetsHeldforSaleDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_6b1a0f89-7465-4700-a35a-9d2dae45a1ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NonOperatedUndividedJointInterestOwnershipPercentageSold_aa21948e-cda3-43d7-9cde-c34058256bd1" xlink:href="paa-20221231.xsd#paa_NonOperatedUndividedJointInterestOwnershipPercentageSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_6b1a0f89-7465-4700-a35a-9d2dae45a1ed" xlink:to="loc_paa_NonOperatedUndividedJointInterestOwnershipPercentageSold_aa21948e-cda3-43d7-9cde-c34058256bd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfInterestInJointVenture_b123b915-3c44-4fda-86fa-5abe8ec0e6bf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromDivestitureOfInterestInJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_6b1a0f89-7465-4700-a35a-9d2dae45a1ed" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfInterestInJointVenture_b123b915-3c44-4fda-86fa-5abe8ec0e6bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup_ed0db94d-d937-484a-be23-eb3e6a3cb5fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_6b1a0f89-7465-4700-a35a-9d2dae45a1ed" xlink:to="loc_us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup_ed0db94d-d937-484a-be23-eb3e6a3cb5fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08b7c2bd-e0f6-47b3-aa7c-961baf825497" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_6b1a0f89-7465-4700-a35a-9d2dae45a1ed" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08b7c2bd-e0f6-47b3-aa7c-961baf825497" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_d4dc9045-4e78-4e23-9400-b74e6e10b483" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08b7c2bd-e0f6-47b3-aa7c-961baf825497" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_d4dc9045-4e78-4e23-9400-b74e6e10b483" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_d4dc9045-4e78-4e23-9400-b74e6e10b483_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_d4dc9045-4e78-4e23-9400-b74e6e10b483" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_d4dc9045-4e78-4e23-9400-b74e6e10b483_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_8dc9afa3-5aca-4536-a3d6-d1b40a841c69" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongLivedAssetsHeldForSaleNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis_d4dc9045-4e78-4e23-9400-b74e6e10b483" xlink:to="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_8dc9afa3-5aca-4536-a3d6-d1b40a841c69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_KeyeraFortSaskatchewanFacilityMember_f364a7e3-1697-406c-87f7-e7a7f3af4fd2" xlink:href="paa-20221231.xsd#paa_KeyeraFortSaskatchewanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongLivedAssetsHeldForSaleNameDomain_8dc9afa3-5aca-4536-a3d6-d1b40a841c69" xlink:to="loc_paa_KeyeraFortSaskatchewanFacilityMember_f364a7e3-1697-406c-87f7-e7a7f3af4fd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_428e6f16-2f33-445b-a9d2-698c6d7b0765" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08b7c2bd-e0f6-47b3-aa7c-961baf825497" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_428e6f16-2f33-445b-a9d2-698c6d7b0765" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_428e6f16-2f33-445b-a9d2-698c6d7b0765_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_428e6f16-2f33-445b-a9d2-698c6d7b0765" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_428e6f16-2f33-445b-a9d2-698c6d7b0765_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_5d26c1f1-78ce-4bdb-81f5-fcac13767c9e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_428e6f16-2f33-445b-a9d2-698c6d7b0765" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_5d26c1f1-78ce-4bdb-81f5-fcac13767c9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_28d14aaf-1416-4dc9-bfc5-06564d864277" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_5d26c1f1-78ce-4bdb-81f5-fcac13767c9e" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_28d14aaf-1416-4dc9-bfc5-06564d864277" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_09d29c7e-0fae-480f-8f01-9d7688e1fba9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_08b7c2bd-e0f6-47b3-aa7c-961baf825497" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_09d29c7e-0fae-480f-8f01-9d7688e1fba9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_09d29c7e-0fae-480f-8f01-9d7688e1fba9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_09d29c7e-0fae-480f-8f01-9d7688e1fba9" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_09d29c7e-0fae-480f-8f01-9d7688e1fba9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_c3739940-496b-4081-b2f5-fdfeba56e60a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_09d29c7e-0fae-480f-8f01-9d7688e1fba9" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_c3739940-496b-4081-b2f5-fdfeba56e60a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_0e122a49-7e44-49ff-ad0a-b3dfce7dc279" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_c3739940-496b-4081-b2f5-fdfeba56e60a" xlink:to="loc_us-gaap_SubsequentEventMember_0e122a49-7e44-49ff-ad0a-b3dfce7dc279" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/GoodwillDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#GoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/GoodwillDetails" xlink:type="extended" id="i03359ee57cbf4bd6b4c00e7df29903b9_GoodwillDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_b7bc0ba4-d802-4688-a984-bd44830d56d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_51e6fdd8-650b-46a2-a9fd-9c190f953831" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_b7bc0ba4-d802-4688-a984-bd44830d56d2" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_51e6fdd8-650b-46a2-a9fd-9c190f953831" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GoodwillImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant_7a2e6da1-7c48-4815-b33c-35bf6b2799a8" xlink:href="paa-20221231.xsd#paa_GoodwillImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_b7bc0ba4-d802-4688-a984-bd44830d56d2" xlink:to="loc_paa_GoodwillImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant_7a2e6da1-7c48-4815-b33c-35bf6b2799a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_7e2d796a-0208-4342-8979-d0b21e1e21ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_b7bc0ba4-d802-4688-a984-bd44830d56d2" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_7e2d796a-0208-4342-8979-d0b21e1e21ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_47c9705e-7dab-4860-bac2-9a3b6c8e0983" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_7e2d796a-0208-4342-8979-d0b21e1e21ef" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_47c9705e-7dab-4860-bac2-9a3b6c8e0983" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_47c9705e-7dab-4860-bac2-9a3b6c8e0983_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_47c9705e-7dab-4860-bac2-9a3b6c8e0983" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_47c9705e-7dab-4860-bac2-9a3b6c8e0983_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2bfbfcfe-9bfd-4f83-b6ca-4f3970ef8631" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_47c9705e-7dab-4860-bac2-9a3b6c8e0983" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2bfbfcfe-9bfd-4f83-b6ca-4f3970ef8631" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_c8ba5e58-7076-4fd2-a15e-42ea6986b3de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2bfbfcfe-9bfd-4f83-b6ca-4f3970ef8631" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_c8ba5e58-7076-4fd2-a15e-42ea6986b3de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_770b32ed-1a7f-42a8-bfea-8e0f56aa837e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_7e2d796a-0208-4342-8979-d0b21e1e21ef" xlink:to="loc_us-gaap_ValuationTechniqueAxis_770b32ed-1a7f-42a8-bfea-8e0f56aa837e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_770b32ed-1a7f-42a8-bfea-8e0f56aa837e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_770b32ed-1a7f-42a8-bfea-8e0f56aa837e" xlink:to="loc_us-gaap_ValuationTechniqueDomain_770b32ed-1a7f-42a8-bfea-8e0f56aa837e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_1f3f929a-8c05-44bf-a438-a2a8eee45ea1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_770b32ed-1a7f-42a8-bfea-8e0f56aa837e" xlink:to="loc_us-gaap_ValuationTechniqueDomain_1f3f929a-8c05-44bf-a438-a2a8eee45ea1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_83254bfa-48d1-4cdc-b07b-9442432dbb22" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_1f3f929a-8c05-44bf-a438-a2a8eee45ea1" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_83254bfa-48d1-4cdc-b07b-9442432dbb22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_d69ad2e0-769d-42be-9aa6-acb9fcb58070" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_7e2d796a-0208-4342-8979-d0b21e1e21ef" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_d69ad2e0-769d-42be-9aa6-acb9fcb58070" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_d69ad2e0-769d-42be-9aa6-acb9fcb58070_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_d69ad2e0-769d-42be-9aa6-acb9fcb58070" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_d69ad2e0-769d-42be-9aa6-acb9fcb58070_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_33ea025e-e32a-49bd-a204-37a85bc53285" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_d69ad2e0-769d-42be-9aa6-acb9fcb58070" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_33ea025e-e32a-49bd-a204-37a85bc53285" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_8adad99b-eb54-4cdb-9af6-6752182ccb27" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_33ea025e-e32a-49bd-a204-37a85bc53285" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_8adad99b-eb54-4cdb-9af6-6752182ccb27" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/InvestmentsinUnconsolidatedEntitiesEquityMethodInvestmentsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#InvestmentsinUnconsolidatedEntitiesEquityMethodInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/InvestmentsinUnconsolidatedEntitiesEquityMethodInvestmentsDetails" xlink:type="extended" id="i2fd3023683e34225b73aed16c50c58aa_InvestmentsinUnconsolidatedEntitiesEquityMethodInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_87fa1da2-e3e8-4542-b9ad-c288f9c035e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_87fa1da2-e3e8-4542-b9ad-c288f9c035e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_c191d64f-9c9e-4a18-94de-2c582a8c085b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_us-gaap_EquityMethodInvestments_c191d64f-9c9e-4a18-94de-2c582a8c085b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_afbae46c-8a36-43a9-b4e5-5e91b4c7bf7b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_afbae46c-8a36-43a9-b4e5-5e91b4c7bf7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfInvestments_47c59f81-1046-4ec2-ac7d-5c005c1fc716" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ImpairmentOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_us-gaap_ImpairmentOfInvestments_47c59f81-1046-4ec2-ac7d-5c005c1fc716" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant_0996691b-29f5-4d46-918d-4cfea2b953a2" xlink:href="paa-20221231.xsd#paa_ImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_paa_ImpairmentAnalysisCostOfCapitalTheoreticalMarketParticipant_0996691b-29f5-4d46-918d-4cfea2b953a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityMethodInvestmentOwnershipPercentageSold_9147751c-99b6-42d6-9ead-22948ef48a8a" xlink:href="paa-20221231.xsd#paa_EquityMethodInvestmentOwnershipPercentageSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_paa_EquityMethodInvestmentOwnershipPercentageSold_9147751c-99b6-42d6-9ead-22948ef48a8a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_451b3d9a-fd87-463e-ac97-bf16efc3f22a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromSaleOfEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_us-gaap_ProceedsFromSaleOfEquityMethodInvestments_451b3d9a-fd87-463e-ac97-bf16efc3f22a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_c00d0112-0e11-4146-a842-dde6fa3800f8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal_c00d0112-0e11-4146-a842-dde6fa3800f8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CapitalContributionsToEquityMethodInvesteesExcludingCapitalizedInterest_5f2a7edc-a382-4438-ae7a-4c3f94f4fd37" xlink:href="paa-20221231.xsd#paa_CapitalContributionsToEquityMethodInvesteesExcludingCapitalizedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_paa_CapitalContributionsToEquityMethodInvesteesExcludingCapitalizedInterest_5f2a7edc-a382-4438-ae7a-4c3f94f4fd37" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_d97d06a0-1bcd-4599-876a-7af6ef499400" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_d97d06a0-1bcd-4599-876a-7af6ef499400" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet_2e6beeea-ce5d-4e5b-b06b-e97a66040616" xlink:href="paa-20221231.xsd#paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet_2e6beeea-ce5d-4e5b-b06b-e97a66040616" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NumberOfPipelinesOrPartialPipelinesContributed_4bf879d6-a580-4bc1-ab36-f707e8812154" xlink:href="paa-20221231.xsd#paa_NumberOfPipelinesOrPartialPipelinesContributed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_paa_NumberOfPipelinesOrPartialPipelinesContributed_4bf879d6-a580-4bc1-ab36-f707e8812154" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_9700e5d9-2647-4d63-9871-d2b21cb6c460" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_b623fde8-193a-420f-82d8-4c16975bddd1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_b623fde8-193a-420f-82d8-4c16975bddd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_b623fde8-193a-420f-82d8-4c16975bddd1_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_b623fde8-193a-420f-82d8-4c16975bddd1" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_b623fde8-193a-420f-82d8-4c16975bddd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_b623fde8-193a-420f-82d8-4c16975bddd1" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BridgeTexPipelineCompanyLLCMember_6d929f12-16a4-40ea-aa94-2cd2b3c6dc92" xlink:href="paa-20221231.xsd#paa_BridgeTexPipelineCompanyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_BridgeTexPipelineCompanyLLCMember_6d929f12-16a4-40ea-aa94-2cd2b3c6dc92" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_7913111b-8b97-4576-b231-8636dd6b51ff" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_CactusIIPipelineLLCMember_7913111b-8b97-4576-b231-8636dd6b51ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CaplinePipelineCompanyLLCMember_afbe6dfe-1c03-4a62-9a4f-ab2f5961b1fc" xlink:href="paa-20221231.xsd#paa_CaplinePipelineCompanyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_CaplinePipelineCompanyLLCMember_afbe6dfe-1c03-4a62-9a4f-ab2f5961b1fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DiamondPipelineLLCMember_a00d0488-404f-47cb-93f4-e213366131b0" xlink:href="paa-20221231.xsd#paa_DiamondPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_DiamondPipelineLLCMember_a00d0488-404f-47cb-93f4-e213366131b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EagleFordPipelineLLCMember_043341bf-5bdc-46d5-8164-7615d82308ff" xlink:href="paa-20221231.xsd#paa_EagleFordPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_EagleFordPipelineLLCMember_043341bf-5bdc-46d5-8164-7615d82308ff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EagleFordTerminalsCorpusChristiLLCMember_d71fcce9-928e-4df7-ad0f-f9e013b60289" xlink:href="paa-20221231.xsd#paa_EagleFordTerminalsCorpusChristiLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_EagleFordTerminalsCorpusChristiLLCMember_d71fcce9-928e-4df7-ad0f-f9e013b60289" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OMOGJVLLCMember_5fdf459e-2c25-4d0d-a024-0db47c1d37f5" xlink:href="paa-20221231.xsd#paa_OMOGJVLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_OMOGJVLLCMember_5fdf459e-2c25-4d0d-a024-0db47c1d37f5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SaddlehornPipelineCompanyLLCMember_d94d9497-488a-44bc-b4cd-978a7090f67e" xlink:href="paa-20221231.xsd#paa_SaddlehornPipelineCompanyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_SaddlehornPipelineCompanyLLCMember_d94d9497-488a-44bc-b4cd-978a7090f67e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_WhiteCliffsPipelineLLCMember_843cb3b0-1ff0-403c-84d0-9b8d883949d3" xlink:href="paa-20221231.xsd#paa_WhiteCliffsPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_WhiteCliffsPipelineLLCMember_843cb3b0-1ff0-403c-84d0-9b8d883949d3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_WinktoWebsterPipelineLLCMember_ff4553e5-8378-498c-a461-41e0b6855a8e" xlink:href="paa-20221231.xsd#paa_WinktoWebsterPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_WinktoWebsterPipelineLLCMember_ff4553e5-8378-498c-a461-41e0b6855a8e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OtherEquityMethodInvestmentMember_c2a2da88-b017-40c7-b916-baea4b03de2c" xlink:href="paa-20221231.xsd#paa_OtherEquityMethodInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_OtherEquityMethodInvestmentMember_c2a2da88-b017-40c7-b916-baea4b03de2c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AdvantagePipelineHoldingsLLCMember_9d2aaff6-3569-457e-a21b-8196706d7b8d" xlink:href="paa-20221231.xsd#paa_AdvantagePipelineHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_AdvantagePipelineHoldingsLLCMember_9d2aaff6-3569-457e-a21b-8196706d7b8d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_STACKPipelineLLCMember_e33c3d2f-b601-43d6-94c6-c7887906b60e" xlink:href="paa-20221231.xsd#paa_STACKPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_STACKPipelineLLCMember_e33c3d2f-b601-43d6-94c6-c7887906b60e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_RedOakPiplelineLLCMember_1f504967-9db0-4a23-bf23-7baadaecdcd0" xlink:href="paa-20221231.xsd#paa_RedOakPiplelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b8d544de-f304-4492-a9af-51c16615e1f4" xlink:to="loc_paa_RedOakPiplelineLLCMember_1f504967-9db0-4a23-bf23-7baadaecdcd0" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4d8d5814-98df-4f88-807f-03b5b249307d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4d8d5814-98df-4f88-807f-03b5b249307d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d8d5814-98df-4f88-807f-03b5b249307d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4d8d5814-98df-4f88-807f-03b5b249307d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4d8d5814-98df-4f88-807f-03b5b249307d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e8935f73-88e1-4441-a209-fce21e38b17e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4d8d5814-98df-4f88-807f-03b5b249307d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e8935f73-88e1-4441-a209-fce21e38b17e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_2093a139-086f-4421-b914-e67fcfeb0eb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e8935f73-88e1-4441-a209-fce21e38b17e" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_2093a139-086f-4421-b914-e67fcfeb0eb7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_e4a2d2f1-78e8-42d0-b902-0ba56a0d7388" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_e4a2d2f1-78e8-42d0-b902-0ba56a0d7388" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_e4a2d2f1-78e8-42d0-b902-0ba56a0d7388_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_e4a2d2f1-78e8-42d0-b902-0ba56a0d7388" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_e4a2d2f1-78e8-42d0-b902-0ba56a0d7388_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_3bbb2640-ea4f-4369-b0a6-ef51a1bfc43d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_e4a2d2f1-78e8-42d0-b902-0ba56a0d7388" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_3bbb2640-ea4f-4369-b0a6-ef51a1bfc43d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_84e8a714-ef4f-4c62-9f49-0c588302a840" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_3bbb2640-ea4f-4369-b0a6-ef51a1bfc43d" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_84e8a714-ef4f-4c62-9f49-0c588302a840" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_30b6a6d1-ec50-4f27-a88e-2ce8b16322de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:to="loc_us-gaap_ValuationTechniqueAxis_30b6a6d1-ec50-4f27-a88e-2ce8b16322de" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_30b6a6d1-ec50-4f27-a88e-2ce8b16322de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_30b6a6d1-ec50-4f27-a88e-2ce8b16322de" xlink:to="loc_us-gaap_ValuationTechniqueDomain_30b6a6d1-ec50-4f27-a88e-2ce8b16322de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_57bb0fa6-d4de-4a17-b266-ed76e458f566" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_30b6a6d1-ec50-4f27-a88e-2ce8b16322de" xlink:to="loc_us-gaap_ValuationTechniqueDomain_57bb0fa6-d4de-4a17-b266-ed76e458f566" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_1d5520f4-9232-40c3-a61b-415953f428e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_57bb0fa6-d4de-4a17-b266-ed76e458f566" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_1d5520f4-9232-40c3-a61b-415953f428e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_07f1e618-5e6e-4c5b-9cd5-488b130d57e7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_07f1e618-5e6e-4c5b-9cd5-488b130d57e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_07f1e618-5e6e-4c5b-9cd5-488b130d57e7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_07f1e618-5e6e-4c5b-9cd5-488b130d57e7" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_07f1e618-5e6e-4c5b-9cd5-488b130d57e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_5e504b7a-dfad-4117-a8bf-90cadacb91b0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_07f1e618-5e6e-4c5b-9cd5-488b130d57e7" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_5e504b7a-dfad-4117-a8bf-90cadacb91b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNetMember_713eb580-75d3-4ffe-bec5-f7fff1a8a0c7" xlink:href="paa-20221231.xsd#paa_GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_5e504b7a-dfad-4117-a8bf-90cadacb91b0" xlink:to="loc_paa_GainOnImpairmentOfInvestmentsInUnconsolidatedEntitiesNetMember_713eb580-75d3-4ffe-bec5-f7fff1a8a0c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_47e99f07-8f02-4840-9eec-82f191feb9e9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_47e99f07-8f02-4840-9eec-82f191feb9e9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_47e99f07-8f02-4840-9eec-82f191feb9e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_47e99f07-8f02-4840-9eec-82f191feb9e9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_47e99f07-8f02-4840-9eec-82f191feb9e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab4e5f63-a42b-43a3-a790-0902cd39dc9b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_47e99f07-8f02-4840-9eec-82f191feb9e9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab4e5f63-a42b-43a3-a790-0902cd39dc9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_315df16e-829d-4724-a4a8-34fe469c0d9a" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab4e5f63-a42b-43a3-a790-0902cd39dc9b" xlink:to="loc_paa_CactusIIPipelineLLCMember_315df16e-829d-4724-a4a8-34fe469c0d9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AdvantagePipelineHoldingsLLCMember_4a239b63-158f-47d4-b24d-98d23541770a" xlink:href="paa-20221231.xsd#paa_AdvantagePipelineHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_ab4e5f63-a42b-43a3-a790-0902cd39dc9b" xlink:to="loc_paa_AdvantagePipelineHoldingsLLCMember_4a239b63-158f-47d4-b24d-98d23541770a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_f20e2962-b1f3-4a48-a341-a77a5da4dafd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_f1c37ce1-4d8d-4977-9470-e994c647e807" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_f20e2962-b1f3-4a48-a341-a77a5da4dafd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_f20e2962-b1f3-4a48-a341-a77a5da4dafd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncashOrPartNoncashAcquisitionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_f20e2962-b1f3-4a48-a341-a77a5da4dafd" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_f20e2962-b1f3-4a48-a341-a77a5da4dafd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_abcc780a-cb6f-44bb-9c13-ac83f9b72e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncashOrPartNoncashAcquisitionNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionsByUniqueDescriptionAxis_f20e2962-b1f3-4a48-a341-a77a5da4dafd" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_abcc780a-cb6f-44bb-9c13-ac83f9b72e3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AcquisitionOfAdditionalInterestInExchangeForContributionOfPipelineAssetsMember_0abcb79a-d689-4dc5-91a0-17d4ec7ee3ba" xlink:href="paa-20221231.xsd#paa_AcquisitionOfAdditionalInterestInExchangeForContributionOfPipelineAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoncashOrPartNoncashAcquisitionNameDomain_abcc780a-cb6f-44bb-9c13-ac83f9b72e3f" xlink:to="loc_paa_AcquisitionOfAdditionalInterestInExchangeForContributionOfPipelineAssetsMember_0abcb79a-d689-4dc5-91a0-17d4ec7ee3ba" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/InvestmentsinUnconsolidatedEntitiesSummarizedFinancialInformationDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#InvestmentsinUnconsolidatedEntitiesSummarizedFinancialInformationDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/InvestmentsinUnconsolidatedEntitiesSummarizedFinancialInformationDetails" xlink:type="extended" id="i18d281c61ab04320855e9e470f292419_InvestmentsinUnconsolidatedEntitiesSummarizedFinancialInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_1d2a906d-b440-421b-b280-ef5b2943f467" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:to="loc_us-gaap_AssetsCurrent_1d2a906d-b440-421b-b280-ef5b2943f467" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrent_e4373256-30f9-4c59-9624-fdf4bb16e03e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:to="loc_us-gaap_AssetsNoncurrent_e4373256-30f9-4c59-9624-fdf4bb16e03e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_1ae5ead6-e467-4f4d-8bea-887808b15380" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:to="loc_us-gaap_LiabilitiesCurrent_1ae5ead6-e467-4f4d-8bea-887808b15380" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrent_78e90cd2-dee6-422b-acbc-013aae570389" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:to="loc_us-gaap_LiabilitiesNoncurrent_78e90cd2-dee6-422b-acbc-013aae570389" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_f7467877-d34c-463b-9ff2-9ec35f431de8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:to="loc_us-gaap_Revenues_f7467877-d34c-463b-9ff2-9ec35f431de8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_1ecfda49-9c2a-4bf0-b722-7927a8b58d8e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:to="loc_us-gaap_OperatingIncomeLoss_1ecfda49-9c2a-4bf0-b722-7927a8b58d8e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_f25f02f5-2e46-459f-8a3d-bb1f6dcac79f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:to="loc_us-gaap_GrossProfit_f25f02f5-2e46-459f-8a3d-bb1f6dcac79f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_12e1fde2-a882-45bb-ba04-31e33053c78e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_1aa010b1-762b-426c-ada8-a6f763c8edac" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_12e1fde2-a882-45bb-ba04-31e33053c78e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_399cfbe9-9fe5-4f85-9fa4-c6d724422720" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_12e1fde2-a882-45bb-ba04-31e33053c78e" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_399cfbe9-9fe5-4f85-9fa4-c6d724422720" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_399cfbe9-9fe5-4f85-9fa4-c6d724422720_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_399cfbe9-9fe5-4f85-9fa4-c6d724422720" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_399cfbe9-9fe5-4f85-9fa4-c6d724422720_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_fea82508-6d91-41fa-887d-a36954bf6fcb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis_399cfbe9-9fe5-4f85-9fa4-c6d724422720" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_fea82508-6d91-41fa-887d-a36954bf6fcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember_fed5ac48-d9fa-4349-88d0-5df0418f48c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeDomain_fea82508-6d91-41fa-887d-a36954bf6fcb" xlink:to="loc_us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOrGroupOfInvesteesMember_fed5ac48-d9fa-4349-88d0-5df0418f48c8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/IntangibleAssetNetScheduleofIntangibleAssetsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#IntangibleAssetNetScheduleofIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/IntangibleAssetNetScheduleofIntangibleAssetsDetails" xlink:type="extended" id="ia64b39cf3f10485a950c20d3860bae10_IntangibleAssetNetScheduleofIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_180ac6d5-d2da-48de-9425-695c16c92826" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_40bad365-e5ae-4aeb-b319-554dd00b523b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_180ac6d5-d2da-48de-9425-695c16c92826" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_40bad365-e5ae-4aeb-b319-554dd00b523b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_faffe815-7beb-4793-8227-b8c977c726af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_180ac6d5-d2da-48de-9425-695c16c92826" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_faffe815-7beb-4793-8227-b8c977c726af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b5ed611d-2613-4c40-8ba8-7923fc695838" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_180ac6d5-d2da-48de-9425-695c16c92826" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b5ed611d-2613-4c40-8ba8-7923fc695838" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_fbfd5bdf-52da-457e-8a3b-dd3247b1005e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_180ac6d5-d2da-48de-9425-695c16c92826" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_fbfd5bdf-52da-457e-8a3b-dd3247b1005e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_68969f76-3fb2-418b-aa48-35bce8d477b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_180ac6d5-d2da-48de-9425-695c16c92826" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_68969f76-3fb2-418b-aa48-35bce8d477b8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a3854b73-5bc2-44e3-95dd-7f9a73ae9e30" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_68969f76-3fb2-418b-aa48-35bce8d477b8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a3854b73-5bc2-44e3-95dd-7f9a73ae9e30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a3854b73-5bc2-44e3-95dd-7f9a73ae9e30_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a3854b73-5bc2-44e3-95dd-7f9a73ae9e30" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a3854b73-5bc2-44e3-95dd-7f9a73ae9e30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d1b54ac3-dc00-4d7e-8e26-663f27470e7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a3854b73-5bc2-44e3-95dd-7f9a73ae9e30" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d1b54ac3-dc00-4d7e-8e26-663f27470e7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_a7ace4dc-6240-400b-a7a4-e14bc75f5396" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d1b54ac3-dc00-4d7e-8e26-663f27470e7a" xlink:to="loc_us-gaap_CustomerRelationshipsMember_a7ace4dc-6240-400b-a7a4-e14bc75f5396" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_c1e3c248-f785-445d-8ccd-44065f55d600" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d1b54ac3-dc00-4d7e-8e26-663f27470e7a" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_c1e3c248-f785-445d-8ccd-44065f55d600" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2d47d4e6-ed3b-482f-be98-27ed37ee5574" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_68969f76-3fb2-418b-aa48-35bce8d477b8" xlink:to="loc_srt_RangeAxis_2d47d4e6-ed3b-482f-be98-27ed37ee5574" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2d47d4e6-ed3b-482f-be98-27ed37ee5574_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2d47d4e6-ed3b-482f-be98-27ed37ee5574" xlink:to="loc_srt_RangeMember_2d47d4e6-ed3b-482f-be98-27ed37ee5574_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_1d6fe389-0bbb-4c04-80ce-7ecba8537417" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2d47d4e6-ed3b-482f-be98-27ed37ee5574" xlink:to="loc_srt_RangeMember_1d6fe389-0bbb-4c04-80ce-7ecba8537417" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_5330d941-911c-454a-af49-67c4be34da4f" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1d6fe389-0bbb-4c04-80ce-7ecba8537417" xlink:to="loc_srt_MinimumMember_5330d941-911c-454a-af49-67c4be34da4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_96f3229b-d0e5-41f6-b304-97b4e9c15b06" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_1d6fe389-0bbb-4c04-80ce-7ecba8537417" xlink:to="loc_srt_MaximumMember_96f3229b-d0e5-41f6-b304-97b4e9c15b06" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DebtScheduleofDebtDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DebtScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DebtScheduleofDebtDetails" xlink:type="extended" id="i099cb89911a64d328bd7198185b6ec21_DebtScheduleofDebtDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_8a490641-8bee-4083-8c7e-2913b8e02bb9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowingsAbstract_851515ef-4b18-414a-a204-dd00fb7a5329" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermBorrowingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8a490641-8bee-4083-8c7e-2913b8e02bb9" xlink:to="loc_us-gaap_ShortTermBorrowingsAbstract_851515ef-4b18-414a-a204-dd00fb7a5329" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_d1335f70-4ad4-41ce-9b03-355c0a3d3e64" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermBorrowingsAbstract_851515ef-4b18-414a-a204-dd00fb7a5329" xlink:to="loc_us-gaap_ShortTermBorrowings_d1335f70-4ad4-41ce-9b03-355c0a3d3e64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_42463739-acf2-4cad-aab1-22b0a28161f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermBorrowingsAbstract_851515ef-4b18-414a-a204-dd00fb7a5329" xlink:to="loc_us-gaap_DebtCurrent_42463739-acf2-4cad-aab1-22b0a28161f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_216e9b53-4dc1-481e-a45d-5a3f7d8c8a7e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermBorrowingsAbstract_851515ef-4b18-414a-a204-dd00fb7a5329" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_216e9b53-4dc1-481e-a45d-5a3f7d8c8a7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAbstract_82882158-c6a3-4aec-ba82-b7c156e09683" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8a490641-8bee-4083-8c7e-2913b8e02bb9" xlink:to="loc_us-gaap_LongTermDebtAbstract_82882158-c6a3-4aec-ba82-b7c156e09683" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_a7a15065-31ba-4b7b-9201-4e9c00e59ef6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_82882158-c6a3-4aec-ba82-b7c156e09683" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_a7a15065-31ba-4b7b-9201-4e9c00e59ef6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_d3987c0a-e59d-4cc3-9de0-ddb277e1252e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_82882158-c6a3-4aec-ba82-b7c156e09683" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_d3987c0a-e59d-4cc3-9de0-ddb277e1252e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorLongTermNotes_49c2439e-8040-4993-a95b-d1b7cc78871d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorLongTermNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_82882158-c6a3-4aec-ba82-b7c156e09683" xlink:to="loc_us-gaap_SeniorLongTermNotes_49c2439e-8040-4993-a95b-d1b7cc78871d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebtNoncurrent_15788788-afba-4dd7-ab1f-453f3c7bcb6f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_82882158-c6a3-4aec-ba82-b7c156e09683" xlink:to="loc_us-gaap_OtherLongTermDebtNoncurrent_15788788-afba-4dd7-ab1f-453f3c7bcb6f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_6421c3be-4cee-4309-8547-a228566eb42d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongTermDebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_82882158-c6a3-4aec-ba82-b7c156e09683" xlink:to="loc_us-gaap_LongTermDebtAndCapitalLeaseObligations_6421c3be-4cee-4309-8547-a228566eb42d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndCapitalLeaseObligations_fe389fc8-6b9c-4b01-aef7-e836c8dbbb5d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtAndCapitalLeaseObligations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtAbstract_82882158-c6a3-4aec-ba82-b7c156e09683" xlink:to="loc_us-gaap_DebtAndCapitalLeaseObligations_fe389fc8-6b9c-4b01-aef7-e836c8dbbb5d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_55bde8e6-ef00-45d2-8b4e-bd38e15a4e85" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8a490641-8bee-4083-8c7e-2913b8e02bb9" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_55bde8e6-ef00-45d2-8b4e-bd38e15a4e85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_8012f8e1-d7ba-4804-a4cb-adc312c3cf3f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8a490641-8bee-4083-8c7e-2913b8e02bb9" xlink:to="loc_us-gaap_DebtInstrumentFairValue_8012f8e1-d7ba-4804-a4cb-adc312c3cf3f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c925a673-477f-4870-8b88-c0d34e69ec5a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_8a490641-8bee-4083-8c7e-2913b8e02bb9" xlink:to="loc_us-gaap_DebtInstrumentTable_c925a673-477f-4870-8b88-c0d34e69ec5a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_6a0a1c29-d053-4d84-92be-b30cf8cf2fd1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c925a673-477f-4870-8b88-c0d34e69ec5a" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_6a0a1c29-d053-4d84-92be-b30cf8cf2fd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_6a0a1c29-d053-4d84-92be-b30cf8cf2fd1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_6a0a1c29-d053-4d84-92be-b30cf8cf2fd1" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_6a0a1c29-d053-4d84-92be-b30cf8cf2fd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_91332cc7-615c-4a02-a9b0-ec7bbf43a52a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_6a0a1c29-d053-4d84-92be-b30cf8cf2fd1" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_91332cc7-615c-4a02-a9b0-ec7bbf43a52a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_40f91dbb-9552-493e-9222-66634410cc75" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_91332cc7-615c-4a02-a9b0-ec7bbf43a52a" xlink:to="loc_us-gaap_SeniorNotesMember_40f91dbb-9552-493e-9222-66634410cc75" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OtherDebtMember_3ffc15c2-b2ed-46e6-8338-49e0e8e0e3f4" xlink:href="paa-20221231.xsd#paa_OtherDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_91332cc7-615c-4a02-a9b0-ec7bbf43a52a" xlink:to="loc_paa_OtherDebtMember_3ffc15c2-b2ed-46e6-8338-49e0e8e0e3f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_1b71d690-b301-4157-beca-dd76bdd5cb78" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c925a673-477f-4870-8b88-c0d34e69ec5a" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_1b71d690-b301-4157-beca-dd76bdd5cb78" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1b71d690-b301-4157-beca-dd76bdd5cb78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1b71d690-b301-4157-beca-dd76bdd5cb78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1b71d690-b301-4157-beca-dd76bdd5cb78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_5abbae5d-2084-46c5-b4b9-a4f8f0007ff4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_1b71d690-b301-4157-beca-dd76bdd5cb78" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_5abbae5d-2084-46c5-b4b9-a4f8f0007ff4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_489ec977-9f58-4735-96da-03bbf77d21e1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5abbae5d-2084-46c5-b4b9-a4f8f0007ff4" xlink:to="loc_us-gaap_SeniorNotesMember_489ec977-9f58-4735-96da-03bbf77d21e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OtherLongTermDebtMember_bed0a085-d523-41a6-8296-8c2ad2afb64f" xlink:href="paa-20221231.xsd#paa_OtherLongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_5abbae5d-2084-46c5-b4b9-a4f8f0007ff4" xlink:to="loc_paa_OtherLongTermDebtMember_bed0a085-d523-41a6-8296-8c2ad2afb64f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b1043eb9-b708-49cc-9aeb-c560b206e565" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c925a673-477f-4870-8b88-c0d34e69ec5a" xlink:to="loc_us-gaap_DebtInstrumentAxis_b1043eb9-b708-49cc-9aeb-c560b206e565" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b1043eb9-b708-49cc-9aeb-c560b206e565_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b1043eb9-b708-49cc-9aeb-c560b206e565" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b1043eb9-b708-49cc-9aeb-c560b206e565_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b1043eb9-b708-49cc-9aeb-c560b206e565" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInJune2022At365PercentMember_a9f49674-8812-4b02-8b45-41d512a6ed41" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInJune2022At365PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInJune2022At365PercentMember_a9f49674-8812-4b02-8b45-41d512a6ed41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInJanuary2023At285PercentMember_8559dfb4-c79b-4e26-aa63-f5478c67d159" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInJanuary2023At285PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInJanuary2023At285PercentMember_8559dfb4-c79b-4e26-aa63-f5478c67d159" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInOctober2023At385PercentMember_de860cc9-dd98-4763-889d-e1f13f70aa82" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInOctober2023At385PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInOctober2023At385PercentMember_de860cc9-dd98-4763-889d-e1f13f70aa82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInNovember2024At360PercentMember_4be3cd52-24fa-43ea-ac4a-193fad131366" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInNovember2024At360PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInNovember2024At360PercentMember_4be3cd52-24fa-43ea-ac4a-193fad131366" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInOctober2025At465PercentMember_c5f59be7-6dca-424e-8f36-9a319814fbd9" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInOctober2025At465PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInOctober2025At465PercentMember_c5f59be7-6dca-424e-8f36-9a319814fbd9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueinDecember2026At4.50PercentMember_2e92e286-ea0a-4271-9900-72b70e759894" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueinDecember2026At4.50PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueinDecember2026At4.50PercentMember_2e92e286-ea0a-4271-9900-72b70e759894" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInDecember2029At355PercentMember_2b2df3b7-2331-4ba3-adce-b4ac6d8d9013" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInDecember2029At355PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInDecember2029At355PercentMember_2b2df3b7-2331-4ba3-adce-b4ac6d8d9013" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInSeptember2030At380PercentMember_98d8a777-56f7-4fef-9be4-0fac66f5ba56" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInSeptember2030At380PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInSeptember2030At380PercentMember_98d8a777-56f7-4fef-9be4-0fac66f5ba56" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInMay2036At670PercentMember_321be559-ab48-45d3-80b5-db22b48a0e4c" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInMay2036At670PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInMay2036At670PercentMember_321be559-ab48-45d3-80b5-db22b48a0e4c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInJanuary2037At665PercentMember_de300e14-be25-4165-af27-f1c2936a57a5" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInJanuary2037At665PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInJanuary2037At665PercentMember_de300e14-be25-4165-af27-f1c2936a57a5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInJune2042At515PercentMember_ea1d8a24-7411-46bc-9591-564778a5fa84" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInJune2042At515PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInJune2042At515PercentMember_ea1d8a24-7411-46bc-9591-564778a5fa84" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInJanuary2043At430PercentMember_1a96cd40-1a26-4b2a-8532-40d66675ecb4" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInJanuary2043At430PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInJanuary2043At430PercentMember_1a96cd40-1a26-4b2a-8532-40d66675ecb4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInJune2044At470PercentMember_44b78e61-45e0-4ce6-a94a-87c4546ad375" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInJune2044At470PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInJune2044At470PercentMember_44b78e61-45e0-4ce6-a94a-87c4546ad375" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInFebruary2045At490PercentMember_e1d3efee-458d-40ba-ac7d-89f801ff2cef" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInFebruary2045At490PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_1ba8612a-b308-4ea7-bcb1-a96f9105625e" xlink:to="loc_paa_SeniorNotesDueInFebruary2045At490PercentMember_e1d3efee-458d-40ba-ac7d-89f801ff2cef" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2ebd6288-8488-406d-b696-9b37dbc9c393" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c925a673-477f-4870-8b88-c0d34e69ec5a" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2ebd6288-8488-406d-b696-9b37dbc9c393" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2ebd6288-8488-406d-b696-9b37dbc9c393_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2ebd6288-8488-406d-b696-9b37dbc9c393" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2ebd6288-8488-406d-b696-9b37dbc9c393_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_63a7eb4e-1fb7-48e2-8bd6-41aabba1d104" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_2ebd6288-8488-406d-b696-9b37dbc9c393" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_63a7eb4e-1fb7-48e2-8bd6-41aabba1d104" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_eaaef7b4-0542-4108-92f7-75a9ffb46633" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_63a7eb4e-1fb7-48e2-8bd6-41aabba1d104" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_eaaef7b4-0542-4108-92f7-75a9ffb46633" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DebtCommercialPaperandCreditFacilitiesDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DebtCommercialPaperandCreditFacilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DebtCommercialPaperandCreditFacilitiesDetails" xlink:type="extended" id="i6b9f95b1c01b48ae9f0652ecff7d8fba_DebtCommercialPaperandCreditFacilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_d471f11e-c53b-4853-bab8-d17e0e08c175" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_f764a4a6-3b9a-4a33-973b-5af65183044d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d471f11e-c53b-4853-bab8-d17e0e08c175" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_f764a4a6-3b9a-4a33-973b-5af65183044d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_f36c5649-5a59-4503-bc67-138f8039b086" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d471f11e-c53b-4853-bab8-d17e0e08c175" xlink:to="loc_us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity_f36c5649-5a59-4503-bc67-138f8039b086" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NumberOfOneYearExtensionsProvidedForUnderAgreement_9e4cc32d-efa0-4144-a8e3-599a46d5c99b" xlink:href="paa-20221231.xsd#paa_NumberOfOneYearExtensionsProvidedForUnderAgreement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d471f11e-c53b-4853-bab8-d17e0e08c175" xlink:to="loc_paa_NumberOfOneYearExtensionsProvidedForUnderAgreement_9e4cc32d-efa0-4144-a8e3-599a46d5c99b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended_b91be4c9-b8e3-4b53-a6a7-56f44384373e" xlink:href="paa-20221231.xsd#paa_LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d471f11e-c53b-4853-bab8-d17e0e08c175" xlink:to="loc_paa_LineOfCreditFacilityPeriodForWhichTermOfCreditFacilityMayBeExtended_b91be4c9-b8e3-4b53-a6a7-56f44384373e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSecuredDebt_2603322d-59b1-4e8b-8c80-2fdcf36796d7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfSecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d471f11e-c53b-4853-bab8-d17e0e08c175" xlink:to="loc_us-gaap_RepaymentsOfSecuredDebt_2603322d-59b1-4e8b-8c80-2fdcf36796d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_73b8d3e2-480d-4497-90b0-17e3f4b29e4e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_d471f11e-c53b-4853-bab8-d17e0e08c175" xlink:to="loc_us-gaap_DebtInstrumentTable_73b8d3e2-480d-4497-90b0-17e3f4b29e4e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_5dbe3b50-f2d5-4f60-98b4-b2d4455d7b09" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_73b8d3e2-480d-4497-90b0-17e3f4b29e4e" xlink:to="loc_us-gaap_CreditFacilityAxis_5dbe3b50-f2d5-4f60-98b4-b2d4455d7b09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_5dbe3b50-f2d5-4f60-98b4-b2d4455d7b09_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_5dbe3b50-f2d5-4f60-98b4-b2d4455d7b09" xlink:to="loc_us-gaap_CreditFacilityDomain_5dbe3b50-f2d5-4f60-98b4-b2d4455d7b09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_9b08bc84-d339-4258-a3a3-a159c273cf8f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_5dbe3b50-f2d5-4f60-98b4-b2d4455d7b09" xlink:to="loc_us-gaap_CreditFacilityDomain_9b08bc84-d339-4258-a3a3-a159c273cf8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_cf36d07b-3976-421d-a532-d4d6a3dc66b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_9b08bc84-d339-4258-a3a3-a159c273cf8f" xlink:to="loc_us-gaap_CommercialPaperMember_cf36d07b-3976-421d-a532-d4d6a3dc66b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorSecuredHedgedInventoryFacilityMember_ba4e93b1-1d1d-4eac-8db8-e83060667cda" xlink:href="paa-20221231.xsd#paa_SeniorSecuredHedgedInventoryFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_9b08bc84-d339-4258-a3a3-a159c273cf8f" xlink:to="loc_paa_SeniorSecuredHedgedInventoryFacilityMember_ba4e93b1-1d1d-4eac-8db8-e83060667cda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorUnsecuredRevolvingCreditFacilityMember_80c627f4-a464-4fc8-8f43-8e3eb718fd6f" xlink:href="paa-20221231.xsd#paa_SeniorUnsecuredRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_9b08bc84-d339-4258-a3a3-a159c273cf8f" xlink:to="loc_paa_SeniorUnsecuredRevolvingCreditFacilityMember_80c627f4-a464-4fc8-8f43-8e3eb718fd6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_644ba2d7-e7e2-4fd4-85bb-939065ed72cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_73b8d3e2-480d-4497-90b0-17e3f4b29e4e" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_644ba2d7-e7e2-4fd4-85bb-939065ed72cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_644ba2d7-e7e2-4fd4-85bb-939065ed72cc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_644ba2d7-e7e2-4fd4-85bb-939065ed72cc" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_644ba2d7-e7e2-4fd4-85bb-939065ed72cc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_03a11900-d89e-493d-a14f-df7989b851e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_644ba2d7-e7e2-4fd4-85bb-939065ed72cc" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_03a11900-d89e-493d-a14f-df7989b851e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_6b8f8a13-314d-4e08-95b7-4f5857693e51" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_03a11900-d89e-493d-a14f-df7989b851e8" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_6b8f8a13-314d-4e08-95b7-4f5857693e51" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_17b43a71-2a24-4a9b-82fb-6b8675c42984" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_73b8d3e2-480d-4497-90b0-17e3f4b29e4e" xlink:to="loc_srt_RangeAxis_17b43a71-2a24-4a9b-82fb-6b8675c42984" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_17b43a71-2a24-4a9b-82fb-6b8675c42984_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_17b43a71-2a24-4a9b-82fb-6b8675c42984" xlink:to="loc_srt_RangeMember_17b43a71-2a24-4a9b-82fb-6b8675c42984_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_76e321d4-a4cd-440f-a0c1-2544f6041408" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_17b43a71-2a24-4a9b-82fb-6b8675c42984" xlink:to="loc_srt_RangeMember_76e321d4-a4cd-440f-a0c1-2544f6041408" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d672fb09-74c6-416e-a8e5-9c237410c22b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_76e321d4-a4cd-440f-a0c1-2544f6041408" xlink:to="loc_srt_MinimumMember_d672fb09-74c6-416e-a8e5-9c237410c22b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_6daeb70a-33af-4fff-998c-54953500c03d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_73b8d3e2-480d-4497-90b0-17e3f4b29e4e" xlink:to="loc_us-gaap_DebtInstrumentAxis_6daeb70a-33af-4fff-998c-54953500c03d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6daeb70a-33af-4fff-998c-54953500c03d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_6daeb70a-33af-4fff-998c-54953500c03d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6daeb70a-33af-4fff-998c-54953500c03d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e3fb80e5-d900-4566-8f16-00e26c0c4157" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_6daeb70a-33af-4fff-998c-54953500c03d" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e3fb80e5-d900-4566-8f16-00e26c0c4157" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorUnsecuredRevolvingCreditFacilityMember_0ce67be7-3ce9-445b-80db-f9ff40ea45b2" xlink:href="paa-20221231.xsd#paa_SeniorUnsecuredRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_e3fb80e5-d900-4566-8f16-00e26c0c4157" xlink:to="loc_paa_SeniorUnsecuredRevolvingCreditFacilityMember_0ce67be7-3ce9-445b-80db-f9ff40ea45b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GOZoneTermLoansMember_e36bb3b9-82b5-48ae-8605-8278fcb26003" xlink:href="paa-20221231.xsd#paa_GOZoneTermLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_e3fb80e5-d900-4566-8f16-00e26c0c4157" xlink:to="loc_paa_GOZoneTermLoansMember_e36bb3b9-82b5-48ae-8605-8278fcb26003" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_51ca725c-d9ab-426b-a8e0-36469289247b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_73b8d3e2-480d-4497-90b0-17e3f4b29e4e" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_51ca725c-d9ab-426b-a8e0-36469289247b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_51ca725c-d9ab-426b-a8e0-36469289247b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_51ca725c-d9ab-426b-a8e0-36469289247b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_51ca725c-d9ab-426b-a8e0-36469289247b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4f095620-262c-4e7d-a020-778875c706ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_51ca725c-d9ab-426b-a8e0-36469289247b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4f095620-262c-4e7d-a020-778875c706ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_TermLoanMember_c8209a0c-2322-4435-9ee7-5e770171dd81" xlink:href="paa-20221231.xsd#paa_TermLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4f095620-262c-4e7d-a020-778875c706ed" xlink:to="loc_paa_TermLoanMember_c8209a0c-2322-4435-9ee7-5e770171dd81" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DebtSeniorNotesDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DebtSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DebtSeniorNotesDetails" xlink:type="extended" id="ia3a3f8f7f8cd4e0196417b9c57e9e730_DebtSeniorNotesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_079dc8f2-347e-4ee6-bb07-a1f6c3ec6c8c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest_b13b82b2-db94-493a-82de-73fa56764c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_079dc8f2-347e-4ee6-bb07-a1f6c3ec6c8c" xlink:to="loc_us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest_b13b82b2-db94-493a-82de-73fa56764c5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8b610a20-5587-44f1-bd26-eb2c034b09cb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_079dc8f2-347e-4ee6-bb07-a1f6c3ec6c8c" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_8b610a20-5587-44f1-bd26-eb2c034b09cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesPublicOfferingPrice_b9b7b669-45d5-4e0a-9844-0e34d744d451" xlink:href="paa-20221231.xsd#paa_SeniorNotesPublicOfferingPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_079dc8f2-347e-4ee6-bb07-a1f6c3ec6c8c" xlink:to="loc_paa_SeniorNotesPublicOfferingPrice_b9b7b669-45d5-4e0a-9844-0e34d744d451" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_78a8e5b3-b758-46a3-aa9c-c16a62efded8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_079dc8f2-347e-4ee6-bb07-a1f6c3ec6c8c" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_78a8e5b3-b758-46a3-aa9c-c16a62efded8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_1ddfb01a-5836-4a3b-bbee-d63bb208b1d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfSeniorDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_079dc8f2-347e-4ee6-bb07-a1f6c3ec6c8c" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_1ddfb01a-5836-4a3b-bbee-d63bb208b1d6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_819d07cd-816b-44d4-b16c-ad07eeb93154" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_079dc8f2-347e-4ee6-bb07-a1f6c3ec6c8c" xlink:to="loc_us-gaap_DebtInstrumentTable_819d07cd-816b-44d4-b16c-ad07eeb93154" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_31cacaba-3ef0-4120-8623-6e864cabc222" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_819d07cd-816b-44d4-b16c-ad07eeb93154" xlink:to="loc_srt_OwnershipAxis_31cacaba-3ef0-4120-8623-6e864cabc222" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_31cacaba-3ef0-4120-8623-6e864cabc222_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_31cacaba-3ef0-4120-8623-6e864cabc222" xlink:to="loc_srt_OwnershipDomain_31cacaba-3ef0-4120-8623-6e864cabc222_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_56c5d6f6-e8dc-48b0-aaab-fe39dcdb37bb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_31cacaba-3ef0-4120-8623-6e864cabc222" xlink:to="loc_srt_OwnershipDomain_56c5d6f6-e8dc-48b0-aaab-fe39dcdb37bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ConsolidatedFinanceSubsidiaryIssuerMember_cd735c36-d03c-46af-b559-87c5ab0f2006" xlink:href="paa-20221231.xsd#paa_ConsolidatedFinanceSubsidiaryIssuerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_56c5d6f6-e8dc-48b0-aaab-fe39dcdb37bb" xlink:to="loc_paa_ConsolidatedFinanceSubsidiaryIssuerMember_cd735c36-d03c-46af-b559-87c5ab0f2006" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_544159a1-13ec-41aa-a2ff-49187700a7a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_819d07cd-816b-44d4-b16c-ad07eeb93154" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_544159a1-13ec-41aa-a2ff-49187700a7a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_544159a1-13ec-41aa-a2ff-49187700a7a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_544159a1-13ec-41aa-a2ff-49187700a7a5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_544159a1-13ec-41aa-a2ff-49187700a7a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b3688f72-52d9-4c64-b9ba-cee67d0a5754" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_544159a1-13ec-41aa-a2ff-49187700a7a5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b3688f72-52d9-4c64-b9ba-cee67d0a5754" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_8d893dd0-d224-4c65-b31c-b1e23bc7aed8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_b3688f72-52d9-4c64-b9ba-cee67d0a5754" xlink:to="loc_us-gaap_SeniorNotesMember_8d893dd0-d224-4c65-b31c-b1e23bc7aed8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_1feee917-0c67-4d93-a78f-8e38df12ca6c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_819d07cd-816b-44d4-b16c-ad07eeb93154" xlink:to="loc_us-gaap_DebtInstrumentAxis_1feee917-0c67-4d93-a78f-8e38df12ca6c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_1feee917-0c67-4d93-a78f-8e38df12ca6c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_1feee917-0c67-4d93-a78f-8e38df12ca6c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_1feee917-0c67-4d93-a78f-8e38df12ca6c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_f5249059-5bd4-4111-b385-040826b9f0fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_1feee917-0c67-4d93-a78f-8e38df12ca6c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_f5249059-5bd4-4111-b385-040826b9f0fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInJune2022At365PercentMember_ed37e0ea-222a-4372-be3a-b78b257c248d" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInJune2022At365PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f5249059-5bd4-4111-b385-040826b9f0fd" xlink:to="loc_paa_SeniorNotesDueInJune2022At365PercentMember_ed37e0ea-222a-4372-be3a-b78b257c248d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInFebruary2021At500PercentMember_d32293ef-93ad-4535-837a-0ce600c45b6d" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInFebruary2021At500PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f5249059-5bd4-4111-b385-040826b9f0fd" xlink:to="loc_paa_SeniorNotesDueInFebruary2021At500PercentMember_d32293ef-93ad-4535-837a-0ce600c45b6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInSeptember2030At380PercentMember_4d9cd610-c4d5-4c5c-8b07-116e5fcd5ffa" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInSeptember2030At380PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f5249059-5bd4-4111-b385-040826b9f0fd" xlink:to="loc_paa_SeniorNotesDueInSeptember2030At380PercentMember_4d9cd610-c4d5-4c5c-8b07-116e5fcd5ffa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeniorNotesDueInJanuary2023At285PercentMember_4ff2effa-29d5-4999-84e2-933372973755" xlink:href="paa-20221231.xsd#paa_SeniorNotesDueInJanuary2023At285PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_f5249059-5bd4-4111-b385-040826b9f0fd" xlink:to="loc_paa_SeniorNotesDueInJanuary2023At285PercentMember_4ff2effa-29d5-4999-84e2-933372973755" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_a5c574b2-ab37-44e9-84d8-19fe492694dd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_819d07cd-816b-44d4-b16c-ad07eeb93154" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_a5c574b2-ab37-44e9-84d8-19fe492694dd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a5c574b2-ab37-44e9-84d8-19fe492694dd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_a5c574b2-ab37-44e9-84d8-19fe492694dd" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a5c574b2-ab37-44e9-84d8-19fe492694dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_92d84047-11a7-45c2-b19a-733b8b885139" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_a5c574b2-ab37-44e9-84d8-19fe492694dd" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_92d84047-11a7-45c2-b19a-733b8b885139" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_665f34e5-c598-4e21-8be3-b345cd84df6c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_92d84047-11a7-45c2-b19a-733b8b885139" xlink:to="loc_us-gaap_SubsequentEventMember_665f34e5-c598-4e21-8be3-b345cd84df6c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DebtDebtCovenantsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DebtDebtCovenantsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DebtDebtCovenantsDetails" xlink:type="extended" id="i0b20fce7fc2745ccb8911f323b627ed4_DebtDebtCovenantsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DebtInstrumentCoverageRatioDebtToEBITDAMaximum_9bff8347-8aca-4b5e-a839-2d3ba38ccc26" xlink:href="paa-20221231.xsd#paa_DebtInstrumentCoverageRatioDebtToEBITDAMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:to="loc_paa_DebtInstrumentCoverageRatioDebtToEBITDAMaximum_9bff8347-8aca-4b5e-a839-2d3ba38ccc26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum_475661f3-c4d7-4974-854a-123bfeb79d1f" xlink:href="paa-20221231.xsd#paa_DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:to="loc_paa_DebtInstrumentCoverageRatioDebtToEBITDAAcquisitionPeriodMaximum_475661f3-c4d7-4974-854a-123bfeb79d1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AcquisitionMeasurementPeriodThreshold_57dc30e6-e8d9-4d3b-84ad-d2cd980178f1" xlink:href="paa-20221231.xsd#paa_AcquisitionMeasurementPeriodThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:to="loc_paa_AcquisitionMeasurementPeriodThreshold_57dc30e6-e8d9-4d3b-84ad-d2cd980178f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfDebt_3caeeb61-d508-4d0f-be7d-79911aa7a852" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProceedsFromIssuanceOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfDebt_3caeeb61-d508-4d0f-be7d-79911aa7a852" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfDebt_94ca42be-7f5a-4fa0-a8cf-58bbcd3c12f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RepaymentsOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:to="loc_us-gaap_RepaymentsOfDebt_94ca42be-7f5a-4fa0-a8cf-58bbcd3c12f6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_88d4a82e-ac6e-4060-9dc6-a0330448b34e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:to="loc_us-gaap_DebtInstrumentTerm_88d4a82e-ac6e-4060-9dc6-a0330448b34e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_2babb1b3-0b55-4bef-bd53-c59a3acb6221" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_2babb1b3-0b55-4bef-bd53-c59a3acb6221" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_c67435c9-efab-49bb-afa4-e85ef20da541" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fd1ea2da-ae5d-404f-a01c-9574f2156fc4" xlink:to="loc_us-gaap_DebtInstrumentTable_c67435c9-efab-49bb-afa4-e85ef20da541" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_0db74fe1-74d1-40c0-90b3-97c20ef72e26" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c67435c9-efab-49bb-afa4-e85ef20da541" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_0db74fe1-74d1-40c0-90b3-97c20ef72e26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_0db74fe1-74d1-40c0-90b3-97c20ef72e26_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_0db74fe1-74d1-40c0-90b3-97c20ef72e26" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_0db74fe1-74d1-40c0-90b3-97c20ef72e26_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_9c7f3826-815f-41cc-bc83-ba659a1b7ff2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_0db74fe1-74d1-40c0-90b3-97c20ef72e26" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_9c7f3826-815f-41cc-bc83-ba659a1b7ff2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_50b36fe7-4305-4bd5-a040-5e126243997d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_9c7f3826-815f-41cc-bc83-ba659a1b7ff2" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_50b36fe7-4305-4bd5-a040-5e126243997d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_1e7ac9a3-3077-45d4-81d9-fb9b736fe9b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c67435c9-efab-49bb-afa4-e85ef20da541" xlink:to="loc_us-gaap_CreditFacilityAxis_1e7ac9a3-3077-45d4-81d9-fb9b736fe9b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_1e7ac9a3-3077-45d4-81d9-fb9b736fe9b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_1e7ac9a3-3077-45d4-81d9-fb9b736fe9b8" xlink:to="loc_us-gaap_CreditFacilityDomain_1e7ac9a3-3077-45d4-81d9-fb9b736fe9b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_999ba901-66ec-4991-bfe6-aaacc26be0fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_1e7ac9a3-3077-45d4-81d9-fb9b736fe9b8" xlink:to="loc_us-gaap_CreditFacilityDomain_999ba901-66ec-4991-bfe6-aaacc26be0fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LineOfCreditAndCommercialPaperMember_933c1099-67d4-420d-948a-934316dfb2fe" xlink:href="paa-20221231.xsd#paa_LineOfCreditAndCommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_999ba901-66ec-4991-bfe6-aaacc26be0fb" xlink:to="loc_paa_LineOfCreditAndCommercialPaperMember_933c1099-67d4-420d-948a-934316dfb2fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_3d44a46b-1941-450d-ae7c-e733767107f7" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_c67435c9-efab-49bb-afa4-e85ef20da541" xlink:to="loc_srt_RangeAxis_3d44a46b-1941-450d-ae7c-e733767107f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3d44a46b-1941-450d-ae7c-e733767107f7_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3d44a46b-1941-450d-ae7c-e733767107f7" xlink:to="loc_srt_RangeMember_3d44a46b-1941-450d-ae7c-e733767107f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8db54b8f-789d-40b6-8796-ce194a3189a1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3d44a46b-1941-450d-ae7c-e733767107f7" xlink:to="loc_srt_RangeMember_8db54b8f-789d-40b6-8796-ce194a3189a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_91373304-2c90-43bb-9399-2730161ee9e2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8db54b8f-789d-40b6-8796-ce194a3189a1" xlink:to="loc_srt_MaximumMember_91373304-2c90-43bb-9399-2730161ee9e2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsPreferredUnitIssuanceDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsPreferredUnitIssuanceDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsPreferredUnitIssuanceDetails" xlink:type="extended" id="ief88353a8c794fbabf9d4e574b1464f5_PartnersCapitalandDistributionsPreferredUnitIssuanceDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesIssuedPricePerShare_41b7bb3c-7ca4-428f-a04d-6352427ba5ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SharesIssuedPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_us-gaap_SharesIssuedPricePerShare_41b7bb3c-7ca4-428f-a04d-6352427ba5ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter_4123703b-a1d9-4da4-ab33-38382a9f28f8" xlink:href="paa-20221231.xsd#paa_NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_NumberOfDaysRequiredForDistributionToUnitholdersAfterEndOfQuarter_4123703b-a1d9-4da4-ab33-38382a9f28f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsQuarterlyDistributionsPerUnit_ca3c3c9e-4449-472d-8e03-e05d50a426a9" xlink:href="paa-20221231.xsd#paa_PreferredUnitsQuarterlyDistributionsPerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsQuarterlyDistributionsPerUnit_ca3c3c9e-4449-472d-8e03-e05d50a426a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsAnnualizedDistributionsPerUnit_b5b0bccd-2024-47aa-8c2e-448f52ce2be2" xlink:href="paa-20221231.xsd#paa_PreferredUnitsAnnualizedDistributionsPerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsAnnualizedDistributionsPerUnit_b5b0bccd-2024-47aa-8c2e-448f52ce2be2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsPeriodAfterFifthAndSubsequentAnniversariesForDistributionRateReset_38bb1154-051d-4bf4-953d-dfba9ddd8f84" xlink:href="paa-20221231.xsd#paa_PreferredUnitsPeriodAfterFifthAndSubsequentAnniversariesForDistributionRateReset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsPeriodAfterFifthAndSubsequentAnniversariesForDistributionRateReset_38bb1154-051d-4bf4-953d-dfba9ddd8f84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsNumberOfDistributionRateResetElectionsAllowed_78cd3c07-be89-4a96-ae5f-9a8937cd9e35" xlink:href="paa-20221231.xsd#paa_PreferredUnitsNumberOfDistributionRateResetElectionsAllowed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsNumberOfDistributionRateResetElectionsAllowed_78cd3c07-be89-4a96-ae5f-9a8937cd9e35" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsDistributionRateResetBasisSpreadOnVariableRate_43ecd72d-d1da-4010-8914-55d46c0d0a52" xlink:href="paa-20221231.xsd#paa_PreferredUnitsDistributionRateResetBasisSpreadOnVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsDistributionRateResetBasisSpreadOnVariableRate_43ecd72d-d1da-4010-8914-55d46c0d0a52" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsPeriodAfterSixthAnniversaryForCommencementOfRedemptionOption_cdec0a77-9ef8-42c4-8900-2b025f06cf61" xlink:href="paa-20221231.xsd#paa_PreferredUnitsPeriodAfterSixthAnniversaryForCommencementOfRedemptionOption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsPeriodAfterSixthAnniversaryForCommencementOfRedemptionOption_cdec0a77-9ef8-42c4-8900-2b025f06cf61" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitRedemptionPercentageOfCommonUnitAveragePrice_ee9b9af6-88fb-4c3a-8d40-1f41b19dda93" xlink:href="paa-20221231.xsd#paa_PreferredUnitRedemptionPercentageOfCommonUnitAveragePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitRedemptionPercentageOfCommonUnitAveragePrice_ee9b9af6-88fb-4c3a-8d40-1f41b19dda93" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsRedemptionPriceAsPercentageOfIssuePrice_c455d14d-6580-4e01-843e-4e37c9786740" xlink:href="paa-20221231.xsd#paa_PreferredUnitsRedemptionPriceAsPercentageOfIssuePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsRedemptionPriceAsPercentageOfIssuePrice_c455d14d-6580-4e01-843e-4e37c9786740" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsDistributionRate_52d75b63-65e3-4e34-b25f-2365ffcda40d" xlink:href="paa-20221231.xsd#paa_PreferredUnitsDistributionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsDistributionRate_52d75b63-65e3-4e34-b25f-2365ffcda40d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsConversionRatio_be9414bc-2f6f-4bce-bcd0-9af4507a214b" xlink:href="paa-20221231.xsd#paa_PreferredUnitsConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsConversionRatio_be9414bc-2f6f-4bce-bcd0-9af4507a214b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsConvertibleThresholdPercentageForCommonUnitPriceTrigger_acf2f391-a607-45f0-9ac7-20473c711fab" xlink:href="paa-20221231.xsd#paa_PreferredUnitsConvertibleThresholdPercentageForCommonUnitPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsConvertibleThresholdPercentageForCommonUnitPriceTrigger_acf2f391-a607-45f0-9ac7-20473c711fab" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PreferredUnitsConvertibleThresholdConsecutiveTradingDays_d95304cd-4347-4ad2-aec0-56fcea1a822a" xlink:href="paa-20221231.xsd#paa_PreferredUnitsConvertibleThresholdConsecutiveTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PreferredUnitsConvertibleThresholdConsecutiveTradingDays_d95304cd-4347-4ad2-aec0-56fcea1a822a" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAccountSaleOfUnitsPricePerUnit_e3de5eb9-7131-40a7-a3da-60751deaac90" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAccountSaleOfUnitsPricePerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PartnersCapitalAccountSaleOfUnitsPricePerUnit_e3de5eb9-7131-40a7-a3da-60751deaac90" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_471708f9-e860-4e48-9316-538c5003a97a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_471708f9-e860-4e48-9316-538c5003a97a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_aea8de9d-95be-4362-9841-89ea78e7d336" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_aea8de9d-95be-4362-9841-89ea78e7d336" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePerDollarAmount_d0b78bc1-88b4-4b01-95cc-a5400b1434f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockDividendRatePerDollarAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_us-gaap_PreferredStockDividendRatePerDollarAmount_d0b78bc1-88b4-4b01-95cc-a5400b1434f4" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DistributionPercentageSpread_69d63808-4522-4dc7-af18-950eb51d94c2" xlink:href="paa-20221231.xsd#paa_DistributionPercentageSpread"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_DistributionPercentageSpread_69d63808-4522-4dc7-af18-950eb51d94c2" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockRedemptionPricePerShare_4f51659d-e7a9-4905-bb0a-1f2e7506705c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PreferredStockRedemptionPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_us-gaap_PreferredStockRedemptionPricePerShare_4f51659d-e7a9-4905-bb0a-1f2e7506705c" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsTable_a2b891e4-4bb2-44a8-ad06-1f662fca6e6b" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_d1d2b31b-c418-439f-904d-1e8d7b9b5fa2" xlink:to="loc_paa_PartnersCapitalAndDistributionsTable_a2b891e4-4bb2-44a8-ad06-1f662fca6e6b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_6ab5e4e2-5e93-42d7-b703-e671724fce01" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_a2b891e4-4bb2-44a8-ad06-1f662fca6e6b" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_6ab5e4e2-5e93-42d7-b703-e671724fce01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_6ab5e4e2-5e93-42d7-b703-e671724fce01_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_6ab5e4e2-5e93-42d7-b703-e671724fce01" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_6ab5e4e2-5e93-42d7-b703-e671724fce01_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f03a98cf-2a8a-4586-ad7d-dfeb63467019" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_6ab5e4e2-5e93-42d7-b703-e671724fce01" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f03a98cf-2a8a-4586-ad7d-dfeb63467019" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_644c3d98-c170-4b92-9bcd-2eba9f4c8afd" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f03a98cf-2a8a-4586-ad7d-dfeb63467019" xlink:to="loc_paa_SeriesAPreferredUnitsMember_644c3d98-c170-4b92-9bcd-2eba9f4c8afd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_01f813b3-e233-45cd-8ba8-f7483e8b8191" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f03a98cf-2a8a-4586-ad7d-dfeb63467019" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_01f813b3-e233-45cd-8ba8-f7483e8b8191" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_2fa16869-8b27-4884-9861-b30186f28f52" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_a2b891e4-4bb2-44a8-ad06-1f662fca6e6b" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_2fa16869-8b27-4884-9861-b30186f28f52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_2fa16869-8b27-4884-9861-b30186f28f52_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_2fa16869-8b27-4884-9861-b30186f28f52" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_2fa16869-8b27-4884-9861-b30186f28f52_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_f664b492-f44f-4a44-9aac-4dcbc16b2ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_2fa16869-8b27-4884-9861-b30186f28f52" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_f664b492-f44f-4a44-9aac-4dcbc16b2ce8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_e929e996-3d6a-4ee5-8e93-a98447ae4257" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_f664b492-f44f-4a44-9aac-4dcbc16b2ce8" xlink:to="loc_us-gaap_SubsequentEventMember_e929e996-3d6a-4ee5-8e93-a98447ae4257" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_982236c9-543c-43d2-a33f-f963cdcc0276" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_a2b891e4-4bb2-44a8-ad06-1f662fca6e6b" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_982236c9-543c-43d2-a33f-f963cdcc0276" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_982236c9-543c-43d2-a33f-f963cdcc0276_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_982236c9-543c-43d2-a33f-f963cdcc0276" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_982236c9-543c-43d2-a33f-f963cdcc0276_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_c5ebd038-75fc-4034-a831-335055ec8714" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_982236c9-543c-43d2-a33f-f963cdcc0276" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_c5ebd038-75fc-4034-a831-335055ec8714" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsActivityforSeriesAandBPreferredUnitsandCommonUnitsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsActivityforSeriesAandBPreferredUnitsandCommonUnitsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsActivityforSeriesAandBPreferredUnitsandCommonUnitsDetails" xlink:type="extended" id="ia11e8b9736ef43258cd0ed5075e59860_PartnersCapitalandDistributionsActivityforSeriesAandBPreferredUnitsandCommonUnitsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionLineItems_f1295f94-3cd5-4d19-b483-808979d7aa87" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_b7cfc8b3-4ced-4536-a2ef-8db015956df1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInPartnersCapitalRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_f1295f94-3cd5-4d19-b483-808979d7aa87" xlink:to="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_b7cfc8b3-4ced-4536-a2ef-8db015956df1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_f11124b3-5b55-4b7d-bf67-bba952859ef4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_b7cfc8b3-4ced-4536-a2ef-8db015956df1" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_f11124b3-5b55-4b7d-bf67-bba952859ef4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_24985d68-441b-45ce-ad0f-bb40b62074bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_b7cfc8b3-4ced-4536-a2ef-8db015956df1" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_24985d68-441b-45ce-ad0f-bb40b62074bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountUnitsUnitbasedCompensation_5adfae01-bac0-4115-acf4-9776c2fbd560" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountUnitsUnitbasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_b7cfc8b3-4ced-4536-a2ef-8db015956df1" xlink:to="loc_us-gaap_PartnersCapitalAccountUnitsUnitbasedCompensation_5adfae01-bac0-4115-acf4-9776c2fbd560" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding_68e01aae-19ee-45e3-adbc-eff0ac2909fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsTable_f1dcf58a-45e8-49f4-b906-84f2da2ba5c5" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_f1295f94-3cd5-4d19-b483-808979d7aa87" xlink:to="loc_paa_PartnersCapitalAndDistributionsTable_f1dcf58a-45e8-49f4-b906-84f2da2ba5c5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_aa91d55d-5170-41dc-a581-fa439a5201f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_f1dcf58a-45e8-49f4-b906-84f2da2ba5c5" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_aa91d55d-5170-41dc-a581-fa439a5201f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_aa91d55d-5170-41dc-a581-fa439a5201f0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_aa91d55d-5170-41dc-a581-fa439a5201f0" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_aa91d55d-5170-41dc-a581-fa439a5201f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_6f3f2b71-81dc-49d5-8105-321c6d1e622b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_aa91d55d-5170-41dc-a581-fa439a5201f0" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_6f3f2b71-81dc-49d5-8105-321c6d1e622b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_94ea03a8-aedf-40dd-97c7-d6588e70b149" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_6f3f2b71-81dc-49d5-8105-321c6d1e622b" xlink:to="loc_paa_SeriesAPreferredUnitsMember_94ea03a8-aedf-40dd-97c7-d6588e70b149" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesBPreferredUnitsMember_9233c050-8326-44d8-98b5-e8ccd740b032" xlink:href="paa-20221231.xsd#paa_SeriesBPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_6f3f2b71-81dc-49d5-8105-321c6d1e622b" xlink:to="loc_paa_SeriesBPreferredUnitsMember_9233c050-8326-44d8-98b5-e8ccd740b032" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_c905927b-9d02-4668-b83a-f49fe11a9d20" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_6f3f2b71-81dc-49d5-8105-321c6d1e622b" xlink:to="loc_paa_CommonUnitsMember_c905927b-9d02-4668-b83a-f49fe11a9d20" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsCommonEquityRepurchaseProgramDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsCommonEquityRepurchaseProgramDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsCommonEquityRepurchaseProgramDetails" xlink:type="extended" id="i70bbbf3140e14b2b8de7dc0e926dd2b7_PartnersCapitalandDistributionsCommonEquityRepurchaseProgramDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionLineItems_4dde2a0a-90dd-4f3e-befa-776bafc47255" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_4f850f06-3399-4257-b32d-3fde64990e15" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_4dde2a0a-90dd-4f3e-befa-776bafc47255" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_4f850f06-3399-4257-b32d-3fde64990e15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_12b4c626-9398-4ea0-9774-21f99b6fd13f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_4dde2a0a-90dd-4f3e-befa-776bafc47255" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_12b4c626-9398-4ea0-9774-21f99b6fd13f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_603f9cce-a13b-4ead-b0fd-9978d33e90c8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_4dde2a0a-90dd-4f3e-befa-776bafc47255" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_603f9cce-a13b-4ead-b0fd-9978d33e90c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsTable_2f39fd92-736b-4f7b-8752-6d1869663c77" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_4dde2a0a-90dd-4f3e-befa-776bafc47255" xlink:to="loc_paa_PartnersCapitalAndDistributionsTable_2f39fd92-736b-4f7b-8752-6d1869663c77" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_66ec3afb-98ec-4355-bc4a-78e7f9c809c3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_2f39fd92-736b-4f7b-8752-6d1869663c77" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_66ec3afb-98ec-4355-bc4a-78e7f9c809c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_66ec3afb-98ec-4355-bc4a-78e7f9c809c3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_66ec3afb-98ec-4355-bc4a-78e7f9c809c3" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_66ec3afb-98ec-4355-bc4a-78e7f9c809c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_dc588799-87ce-47f9-8aeb-8ba27358d244" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_66ec3afb-98ec-4355-bc4a-78e7f9c809c3" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_dc588799-87ce-47f9-8aeb-8ba27358d244" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonEquityRepurchaseProgramMember_22c54787-018d-4ea4-83f1-7d835cd7fa09" xlink:href="paa-20221231.xsd#paa_CommonEquityRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_dc588799-87ce-47f9-8aeb-8ba27358d244" xlink:to="loc_paa_CommonEquityRepurchaseProgramMember_22c54787-018d-4ea4-83f1-7d835cd7fa09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5f6f2898-3ddc-4d11-ab0b-4aa5eb297b7d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_2f39fd92-736b-4f7b-8752-6d1869663c77" xlink:to="loc_srt_RangeAxis_5f6f2898-3ddc-4d11-ab0b-4aa5eb297b7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5f6f2898-3ddc-4d11-ab0b-4aa5eb297b7d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_5f6f2898-3ddc-4d11-ab0b-4aa5eb297b7d" xlink:to="loc_srt_RangeMember_5f6f2898-3ddc-4d11-ab0b-4aa5eb297b7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6a1c768d-8019-4523-8c6d-5bbfdead59d6" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_5f6f2898-3ddc-4d11-ab0b-4aa5eb297b7d" xlink:to="loc_srt_RangeMember_6a1c768d-8019-4523-8c6d-5bbfdead59d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_99e405c4-001a-4b57-8935-a4316e812c7c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6a1c768d-8019-4523-8c6d-5bbfdead59d6" xlink:to="loc_srt_MaximumMember_99e405c4-001a-4b57-8935-a4316e812c7c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_5faf585f-c84e-403c-9e1c-dcfef60b534b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_2f39fd92-736b-4f7b-8752-6d1869663c77" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_5faf585f-c84e-403c-9e1c-dcfef60b534b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_5faf585f-c84e-403c-9e1c-dcfef60b534b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_5faf585f-c84e-403c-9e1c-dcfef60b534b" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_5faf585f-c84e-403c-9e1c-dcfef60b534b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_0a1f29a0-94bc-404a-a262-1db53fa3a787" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_5faf585f-c84e-403c-9e1c-dcfef60b534b" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_0a1f29a0-94bc-404a-a262-1db53fa3a787" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_0f141ceb-438e-4c40-ac6c-24944cacf10f" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_0a1f29a0-94bc-404a-a262-1db53fa3a787" xlink:to="loc_paa_CommonUnitsMember_0f141ceb-438e-4c40-ac6c-24944cacf10f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsPreferredUnitDistributionsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsPreferredUnitDistributionsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsPreferredUnitDistributionsDetails" xlink:type="extended" id="i42a8dd0e530b48ddbcc7d2a2cb7ed204_PartnersCapitalandDistributionsPreferredUnitDistributionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionLineItems_0aae0df6-aaf9-40f3-b80e-f48ba9217eb9" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStock_6acbc4d9-d076-4054-8d37-72eb4a585dc3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0aae0df6-aaf9-40f3-b80e-f48ba9217eb9" xlink:to="loc_us-gaap_DividendsPreferredStock_6acbc4d9-d076-4054-8d37-72eb4a585dc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_ef27f494-3452-4c1f-a8d7-1857cb05ad7b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0aae0df6-aaf9-40f3-b80e-f48ba9217eb9" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_ef27f494-3452-4c1f-a8d7-1857cb05ad7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsTable_48d2245b-f790-408a-8c10-9c5ba1edcafe" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0aae0df6-aaf9-40f3-b80e-f48ba9217eb9" xlink:to="loc_paa_PartnersCapitalAndDistributionsTable_48d2245b-f790-408a-8c10-9c5ba1edcafe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_db6bd62d-7a52-4b3e-911f-4d14c9b5fc4d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_48d2245b-f790-408a-8c10-9c5ba1edcafe" xlink:to="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_db6bd62d-7a52-4b3e-911f-4d14c9b5fc4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_db6bd62d-7a52-4b3e-911f-4d14c9b5fc4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_db6bd62d-7a52-4b3e-911f-4d14c9b5fc4d" xlink:to="loc_us-gaap_DistributionTypeDomain_db6bd62d-7a52-4b3e-911f-4d14c9b5fc4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_046505e4-8ab6-4824-9d87-2c2705c22da3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_db6bd62d-7a52-4b3e-911f-4d14c9b5fc4d" xlink:to="loc_us-gaap_DistributionTypeDomain_046505e4-8ab6-4824-9d87-2c2705c22da3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDistributionMember_04a3b007-2a3a-4d40-83f0-c0c474b9f6d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionTypeDomain_046505e4-8ab6-4824-9d87-2c2705c22da3" xlink:to="loc_us-gaap_CashDistributionMember_04a3b007-2a3a-4d40-83f0-c0c474b9f6d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f07c2ae6-464d-4ae5-b035-51dd8d5a1f49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_48d2245b-f790-408a-8c10-9c5ba1edcafe" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f07c2ae6-464d-4ae5-b035-51dd8d5a1f49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f07c2ae6-464d-4ae5-b035-51dd8d5a1f49_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f07c2ae6-464d-4ae5-b035-51dd8d5a1f49" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f07c2ae6-464d-4ae5-b035-51dd8d5a1f49_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_84611ddd-c498-4a83-96de-856acbe480f1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f07c2ae6-464d-4ae5-b035-51dd8d5a1f49" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_84611ddd-c498-4a83-96de-856acbe480f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SeriesAPreferredUnitsMember_f6f149e6-cd09-46c5-afd4-69ffb86a09fa" xlink:href="paa-20221231.xsd#paa_SeriesAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_84611ddd-c498-4a83-96de-856acbe480f1" xlink:to="loc_paa_SeriesAPreferredUnitsMember_f6f149e6-cd09-46c5-afd4-69ffb86a09fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_8b6685e9-04f3-4fcf-839f-47f5da68a9b9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_84611ddd-c498-4a83-96de-856acbe480f1" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_8b6685e9-04f3-4fcf-839f-47f5da68a9b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_11eb419a-5e08-4c0d-bf20-6b191454239b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_48d2245b-f790-408a-8c10-9c5ba1edcafe" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_11eb419a-5e08-4c0d-bf20-6b191454239b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_11eb419a-5e08-4c0d-bf20-6b191454239b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_11eb419a-5e08-4c0d-bf20-6b191454239b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_11eb419a-5e08-4c0d-bf20-6b191454239b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_8853b99f-6c8a-4676-bbd2-563933837441" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_11eb419a-5e08-4c0d-bf20-6b191454239b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_8853b99f-6c8a-4676-bbd2-563933837441" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_15b5948d-ac51-40e1-ba28-c40a9d7fb758" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_8853b99f-6c8a-4676-bbd2-563933837441" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_15b5948d-ac51-40e1-ba28-c40a9d7fb758" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_4b001401-d828-4efb-8275-a66cbb2a881e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_48d2245b-f790-408a-8c10-9c5ba1edcafe" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_4b001401-d828-4efb-8275-a66cbb2a881e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_4b001401-d828-4efb-8275-a66cbb2a881e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_4b001401-d828-4efb-8275-a66cbb2a881e" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_4b001401-d828-4efb-8275-a66cbb2a881e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a74ca72b-4b13-4dcc-8cd9-dac723f66764" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_4b001401-d828-4efb-8275-a66cbb2a881e" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a74ca72b-4b13-4dcc-8cd9-dac723f66764" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_1afc82a7-b22c-4d65-afa5-0c87aeec67a1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_a74ca72b-4b13-4dcc-8cd9-dac723f66764" xlink:to="loc_us-gaap_SubsequentEventMember_1afc82a7-b22c-4d65-afa5-0c87aeec67a1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsCommonUnitDistributionsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsCommonUnitDistributionsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsCommonUnitDistributionsDetails" xlink:type="extended" id="i539ab81dc0d74178a737dc00564029a9_PartnersCapitalandDistributionsCommonUnitDistributionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerLineItems_851026e8-6ab6-4d58-a5da-848cc71e1af4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionMadeToLimitedPartnerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountDistributions_d682052a-bce5-42f7-9d53-86f66b87c278" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionMadeToLimitedPartnerLineItems_851026e8-6ab6-4d58-a5da-848cc71e1af4" xlink:to="loc_us-gaap_PartnersCapitalAccountDistributions_d682052a-bce5-42f7-9d53-86f66b87c278" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit_6df226ee-18b5-4981-9990-693ced3b21b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionMadeToLimitedPartnerLineItems_851026e8-6ab6-4d58-a5da-848cc71e1af4" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit_6df226ee-18b5-4981-9990-693ced3b21b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit_9391734a-ecc7-4199-843f-e0c4e3c68b74" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionMadeToLimitedPartnerLineItems_851026e8-6ab6-4d58-a5da-848cc71e1af4" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit_9391734a-ecc7-4199-843f-e0c4e3c68b74" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToLimitedPartnerTable_b685a620-ff52-42d7-860b-cf5f9d8c4625" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionsMadeToLimitedPartnerTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DistributionMadeToLimitedPartnerLineItems_851026e8-6ab6-4d58-a5da-848cc71e1af4" xlink:to="loc_us-gaap_DistributionsMadeToLimitedPartnerTable_b685a620-ff52-42d7-860b-cf5f9d8c4625" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f4a9139c-638a-4bab-af9b-dfc0c181f3f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DistributionsMadeToLimitedPartnerTable_b685a620-ff52-42d7-860b-cf5f9d8c4625" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f4a9139c-638a-4bab-af9b-dfc0c181f3f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f4a9139c-638a-4bab-af9b-dfc0c181f3f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f4a9139c-638a-4bab-af9b-dfc0c181f3f3" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_f4a9139c-638a-4bab-af9b-dfc0c181f3f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_3259d50f-4063-4909-a717-c343c4db2d9e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_f4a9139c-638a-4bab-af9b-dfc0c181f3f3" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_3259d50f-4063-4909-a717-c343c4db2d9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CommonUnitsMember_1b9305e0-549f-4cd6-9d65-b48bc6486fb4" xlink:href="paa-20221231.xsd#paa_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_3259d50f-4063-4909-a717-c343c4db2d9e" xlink:to="loc_paa_CommonUnitsMember_1b9305e0-549f-4cd6-9d65-b48bc6486fb4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_63d10bff-9e25-4a97-b963-3483e787d8cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DistributionsMadeToLimitedPartnerTable_b685a620-ff52-42d7-860b-cf5f9d8c4625" xlink:to="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_63d10bff-9e25-4a97-b963-3483e787d8cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_63d10bff-9e25-4a97-b963-3483e787d8cf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_63d10bff-9e25-4a97-b963-3483e787d8cf" xlink:to="loc_us-gaap_DistributionTypeDomain_63d10bff-9e25-4a97-b963-3483e787d8cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_143e9e5e-3868-4988-9745-a8b95cc59150" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_63d10bff-9e25-4a97-b963-3483e787d8cf" xlink:to="loc_us-gaap_DistributionTypeDomain_143e9e5e-3868-4988-9745-a8b95cc59150" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDistributionMember_dda17702-8677-4454-843b-71c22fbec97a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionTypeDomain_143e9e5e-3868-4988-9745-a8b95cc59150" xlink:to="loc_us-gaap_CashDistributionMember_dda17702-8677-4454-843b-71c22fbec97a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_800ead41-fcb8-4409-92a6-acaaffec18f9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DistributionsMadeToLimitedPartnerTable_b685a620-ff52-42d7-860b-cf5f9d8c4625" xlink:to="loc_srt_CounterpartyNameAxis_800ead41-fcb8-4409-92a6-acaaffec18f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_800ead41-fcb8-4409-92a6-acaaffec18f9_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_800ead41-fcb8-4409-92a6-acaaffec18f9" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_800ead41-fcb8-4409-92a6-acaaffec18f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0e8b6b7c-665b-4cf1-9c6d-b0cbd9ab8d01" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_800ead41-fcb8-4409-92a6-acaaffec18f9" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0e8b6b7c-665b-4cf1-9c6d-b0cbd9ab8d01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PublicUnitHoldersMember_6cfbfc06-5ac4-465c-9c2f-314e0c2039fc" xlink:href="paa-20221231.xsd#paa_PublicUnitHoldersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0e8b6b7c-665b-4cf1-9c6d-b0cbd9ab8d01" xlink:to="loc_paa_PublicUnitHoldersMember_6cfbfc06-5ac4-465c-9c2f-314e0c2039fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAAPLPMember_7ceda9f0-e9da-47d0-9615-13ea4a2d9d6e" xlink:href="paa-20221231.xsd#paa_PlainsAAPLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_0e8b6b7c-665b-4cf1-9c6d-b0cbd9ab8d01" xlink:to="loc_paa_PlainsAAPLPMember_7ceda9f0-e9da-47d0-9615-13ea4a2d9d6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsAxis_33fbb95d-6f91-4580-b90f-e353979b27fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DistributionsMadeToLimitedPartnerTable_b685a620-ff52-42d7-860b-cf5f9d8c4625" xlink:to="loc_us-gaap_DividendsAxis_33fbb95d-6f91-4580-b90f-e353979b27fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_33fbb95d-6f91-4580-b90f-e353979b27fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DividendsAxis_33fbb95d-6f91-4580-b90f-e353979b27fb" xlink:to="loc_us-gaap_DividendsDomain_33fbb95d-6f91-4580-b90f-e353979b27fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsDomain_d9630889-6ba1-4ea8-af1d-0a9792cf405c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DividendsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DividendsAxis_33fbb95d-6f91-4580-b90f-e353979b27fb" xlink:to="loc_us-gaap_DividendsDomain_d9630889-6ba1-4ea8-af1d-0a9792cf405c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_FourthQuarterDistributionMember_cb37f9f2-28e3-4414-aaf8-95678ebe1da8" xlink:href="paa-20221231.xsd#paa_FourthQuarterDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsDomain_d9630889-6ba1-4ea8-af1d-0a9792cf405c" xlink:to="loc_paa_FourthQuarterDistributionMember_cb37f9f2-28e3-4414-aaf8-95678ebe1da8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_4ae9422f-d87d-403f-a215-bf426e105535" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DistributionsMadeToLimitedPartnerTable_b685a620-ff52-42d7-860b-cf5f9d8c4625" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_4ae9422f-d87d-403f-a215-bf426e105535" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_4ae9422f-d87d-403f-a215-bf426e105535_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_4ae9422f-d87d-403f-a215-bf426e105535" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_4ae9422f-d87d-403f-a215-bf426e105535_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_7870b452-5bcc-4310-86b2-246813ce3921" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_4ae9422f-d87d-403f-a215-bf426e105535" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_7870b452-5bcc-4310-86b2-246813ce3921" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_297f4b10-facd-413f-9578-b1c0a2e01a86" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_7870b452-5bcc-4310-86b2-246813ce3921" xlink:to="loc_us-gaap_SubsequentEventMember_297f4b10-facd-413f-9578-b1c0a2e01a86" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsNoncontrollingInterestsinSubsidiariesDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsNoncontrollingInterestsinSubsidiariesDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsNoncontrollingInterestsinSubsidiariesDetails" xlink:type="extended" id="i119e0fe1d01448599c7982dd7f80d3cd_PartnersCapitalandDistributionsNoncontrollingInterestsinSubsidiariesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_6f6b38b5-bdf3-47ee-9b62-ddcd27155dcf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_6f6b38b5-bdf3-47ee-9b62-ddcd27155dcf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_fd9a243e-ab50-4cc1-977a-a8088d8740c6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_fd9a243e-ab50-4cc1-977a-a8088d8740c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_378678a7-1a79-4496-b944-7b80af696a58" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_378678a7-1a79-4496-b944-7b80af696a58" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountAcquisitions_9bb1efac-1a9f-4ec0-8db8-a186155e3c7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_us-gaap_PartnersCapitalAccountAcquisitions_9bb1efac-1a9f-4ec0-8db8-a186155e3c7d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest_21937c07-8549-4aad-bc2e-ada522dbbf19" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest_21937c07-8549-4aad-bc2e-ada522dbbf19" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_372a52ad-2ce8-4487-8e1d-317b8b56a7e5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_us-gaap_PartnersCapitalAttributableToNoncontrollingInterest_372a52ad-2ce8-4487-8e1d-317b8b56a7e5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_5376cd86-1194-4e47-b36d-3c1cc9e2bfc1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage_5376cd86-1194-4e47-b36d-3c1cc9e2bfc1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_f8541de2-f0b2-4f58-b0ec-ed203ed5c268" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination_f8541de2-f0b2-4f58-b0ec-ed203ed5c268" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_0f074830-1767-45bb-a072-b9b206025d9e" xlink:to="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_806ee60c-e326-4b85-a880-17d3847e7e30" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:to="loc_srt_OwnershipAxis_806ee60c-e326-4b85-a880-17d3847e7e30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_806ee60c-e326-4b85-a880-17d3847e7e30_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_806ee60c-e326-4b85-a880-17d3847e7e30" xlink:to="loc_srt_OwnershipDomain_806ee60c-e326-4b85-a880-17d3847e7e30_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_69a9a182-6236-4bd3-9186-9c33b20b48ee" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_806ee60c-e326-4b85-a880-17d3847e7e30" xlink:to="loc_srt_OwnershipDomain_69a9a182-6236-4bd3-9186-9c33b20b48ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_3f662370-1a94-4a52-a74c-b3bea1f49fe4" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_69a9a182-6236-4bd3-9186-9c33b20b48ee" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_3f662370-1a94-4a52-a74c-b3bea1f49fe4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_836294ba-7c41-4a82-bd03-522b3288762e" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_69a9a182-6236-4bd3-9186-9c33b20b48ee" xlink:to="loc_paa_CactusIIPipelineLLCMember_836294ba-7c41-4a82-bd03-522b3288762e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_RedRiverPipelineCompanyLLCMember_cc3dc1a7-c5b6-4d22-a3da-2d3e3986c0bd" xlink:href="paa-20221231.xsd#paa_RedRiverPipelineCompanyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_69a9a182-6236-4bd3-9186-9c33b20b48ee" xlink:to="loc_paa_RedRiverPipelineCompanyLLCMember_cc3dc1a7-c5b6-4d22-a3da-2d3e3986c0bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_e9fec50a-964f-4250-a0e2-b1a908c279e9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_e9fec50a-964f-4250-a0e2-b1a908c279e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_e9fec50a-964f-4250-a0e2-b1a908c279e9_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_e9fec50a-964f-4250-a0e2-b1a908c279e9" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_e9fec50a-964f-4250-a0e2-b1a908c279e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_7ae7de72-30f9-4487-b88b-3c55855dfcd2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_e9fec50a-964f-4250-a0e2-b1a908c279e9" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_7ae7de72-30f9-4487-b88b-3c55855dfcd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_25d1a992-826f-4577-bc11-bf958c01aba5" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_7ae7de72-30f9-4487-b88b-3c55855dfcd2" xlink:to="loc_paa_CactusIIPipelineLLCMember_25d1a992-826f-4577-bc11-bf958c01aba5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_6c164a78-6c48-45fe-9be3-830c2931be73" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:to="loc_srt_CounterpartyNameAxis_6c164a78-6c48-45fe-9be3-830c2931be73" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_6c164a78-6c48-45fe-9be3-830c2931be73_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_6c164a78-6c48-45fe-9be3-830c2931be73" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_6c164a78-6c48-45fe-9be3-830c2931be73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d7eee601-18c3-4e7b-b8e4-ae25b9da82dc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_6c164a78-6c48-45fe-9be3-830c2931be73" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d7eee601-18c3-4e7b-b8e4-ae25b9da82dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EnbridgeMember_27adbd16-7efc-4d4e-a753-466ce08ee843" xlink:href="paa-20221231.xsd#paa_EnbridgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d7eee601-18c3-4e7b-b8e4-ae25b9da82dc" xlink:to="loc_paa_EnbridgeMember_27adbd16-7efc-4d4e-a753-466ce08ee843" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_33a4b70f-5e3b-4ab3-a0dc-9548f23c62a5" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_d7eee601-18c3-4e7b-b8e4-ae25b9da82dc" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_33a4b70f-5e3b-4ab3-a0dc-9548f23c62a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_15a23930-8d01-4254-812b-53dbcb268899" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_15a23930-8d01-4254-812b-53dbcb268899" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_15a23930-8d01-4254-812b-53dbcb268899_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_15a23930-8d01-4254-812b-53dbcb268899" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_15a23930-8d01-4254-812b-53dbcb268899_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b7177663-6cb3-4ad8-9cf9-2e5ef06599d7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_15a23930-8d01-4254-812b-53dbcb268899" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b7177663-6cb3-4ad8-9cf9-2e5ef06599d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_16d75066-5e7b-4dc5-b8cc-a3ae45cd286a" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b7177663-6cb3-4ad8-9cf9-2e5ef06599d7" xlink:to="loc_paa_CactusIIPipelineLLCMember_16d75066-5e7b-4dc5-b8cc-a3ae45cd286a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_71acef99-bba0-4743-a3e3-e396c6877f2d" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_b7177663-6cb3-4ad8-9cf9-2e5ef06599d7" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_71acef99-bba0-4743-a3e3-e396c6877f2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_e48fc2be-077c-47af-bbb6-f570cd07eb00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_e48fc2be-077c-47af-bbb6-f570cd07eb00" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_e48fc2be-077c-47af-bbb6-f570cd07eb00_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_e48fc2be-077c-47af-bbb6-f570cd07eb00" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_e48fc2be-077c-47af-bbb6-f570cd07eb00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_77ba1721-ed98-4222-8f2b-5b1b97485665" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_e48fc2be-077c-47af-bbb6-f570cd07eb00" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_77ba1721-ed98-4222-8f2b-5b1b97485665" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_37505863-3f77-4ec8-8fa9-1518d53424cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_77ba1721-ed98-4222-8f2b-5b1b97485665" xlink:to="loc_us-gaap_NoncontrollingInterestMember_37505863-3f77-4ec8-8fa9-1518d53424cf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_01937e07-f018-4e33-a246-ebbdffbd01e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_77ba1721-ed98-4222-8f2b-5b1b97485665" xlink:to="loc_us-gaap_ParentMember_01937e07-f018-4e33-a246-ebbdffbd01e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_1d9ec597-ba2a-4416-ad0a-2f583af6434e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:to="loc_us-gaap_TransactionTypeAxis_1d9ec597-ba2a-4416-ad0a-2f583af6434e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_1d9ec597-ba2a-4416-ad0a-2f583af6434e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_1d9ec597-ba2a-4416-ad0a-2f583af6434e" xlink:to="loc_us-gaap_TransactionDomain_1d9ec597-ba2a-4416-ad0a-2f583af6434e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_0c18d11c-5ec0-47fc-bfd4-52ec93939d03" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_1d9ec597-ba2a-4416-ad0a-2f583af6434e" xlink:to="loc_us-gaap_TransactionDomain_0c18d11c-5ec0-47fc-bfd4-52ec93939d03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_JointVentureFormationMember_d2b99dc0-00d0-49e3-a205-de9e85155cce" xlink:href="paa-20221231.xsd#paa_JointVentureFormationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_0c18d11c-5ec0-47fc-bfd4-52ec93939d03" xlink:to="loc_paa_JointVentureFormationMember_d2b99dc0-00d0-49e3-a205-de9e85155cce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_c5d4673e-2a27-4314-84e5-5ebc057550ad" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_5bf15f31-18ca-4059-91c7-28eee95d19d4" xlink:to="loc_dei_LegalEntityAxis_c5d4673e-2a27-4314-84e5-5ebc057550ad" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_c5d4673e-2a27-4314-84e5-5ebc057550ad_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_c5d4673e-2a27-4314-84e5-5ebc057550ad" xlink:to="loc_dei_EntityDomain_c5d4673e-2a27-4314-84e5-5ebc057550ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_36d35931-076d-4459-b0de-bf389106f19e" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_c5d4673e-2a27-4314-84e5-5ebc057550ad" xlink:to="loc_dei_EntityDomain_36d35931-076d-4459-b0de-bf389106f19e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OryxMidstreamHoldingsLLCMember_393f15fc-75e4-448c-8933-800b3966bf1f" xlink:href="paa-20221231.xsd#paa_OryxMidstreamHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_36d35931-076d-4459-b0de-bf389106f19e" xlink:to="loc_paa_OryxMidstreamHoldingsLLCMember_393f15fc-75e4-448c-8933-800b3966bf1f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsDistributionstoNoncontrollingInterestsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsDistributionstoNoncontrollingInterestsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsDistributionstoNoncontrollingInterestsDetails" xlink:type="extended" id="i3d46108e8ec14defa532fc24b1a4b3d7_PartnersCapitalandDistributionsDistributionstoNoncontrollingInterestsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionLineItems_c1022791-8874-4d41-9478-ea4b3f252f6c" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountDistributions_dc7fa5bb-90ec-4e09-9193-97198fec8e13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_c1022791-8874-4d41-9478-ea4b3f252f6c" xlink:to="loc_us-gaap_PartnersCapitalAccountDistributions_dc7fa5bb-90ec-4e09-9193-97198fec8e13" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsTable_d5f599a1-d2ad-438f-81c9-7ee6447934af" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_PartnersCapitalAndDistributionLineItems_c1022791-8874-4d41-9478-ea4b3f252f6c" xlink:to="loc_paa_PartnersCapitalAndDistributionsTable_d5f599a1-d2ad-438f-81c9-7ee6447934af" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_391231af-33a3-48f7-a352-2bd589ed0321" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_d5f599a1-d2ad-438f-81c9-7ee6447934af" xlink:to="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_391231af-33a3-48f7-a352-2bd589ed0321" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_391231af-33a3-48f7-a352-2bd589ed0321_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_391231af-33a3-48f7-a352-2bd589ed0321" xlink:to="loc_us-gaap_DistributionTypeDomain_391231af-33a3-48f7-a352-2bd589ed0321_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_ea1a9373-e205-4a30-ae65-7d0d5b1dfdb8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_391231af-33a3-48f7-a352-2bd589ed0321" xlink:to="loc_us-gaap_DistributionTypeDomain_ea1a9373-e205-4a30-ae65-7d0d5b1dfdb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDistributionMember_58384c01-4016-4a48-9ac1-499448a98dc2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionTypeDomain_ea1a9373-e205-4a30-ae65-7d0d5b1dfdb8" xlink:to="loc_us-gaap_CashDistributionMember_58384c01-4016-4a48-9ac1-499448a98dc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_b4658774-6c21-48e9-a7cb-bd34f2db4b75" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_d5f599a1-d2ad-438f-81c9-7ee6447934af" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_b4658774-6c21-48e9-a7cb-bd34f2db4b75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_b4658774-6c21-48e9-a7cb-bd34f2db4b75_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_b4658774-6c21-48e9-a7cb-bd34f2db4b75" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_b4658774-6c21-48e9-a7cb-bd34f2db4b75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_b073748a-3c56-4567-bc99-4758224ca8af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_b4658774-6c21-48e9-a7cb-bd34f2db4b75" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_b073748a-3c56-4567-bc99-4758224ca8af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_71499986-f047-4351-a55f-25af93bcac70" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_b073748a-3c56-4567-bc99-4758224ca8af" xlink:to="loc_us-gaap_NoncontrollingInterestMember_71499986-f047-4351-a55f-25af93bcac70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_4f7aeb85-caf7-45c3-ad75-fa3f23946487" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_d5f599a1-d2ad-438f-81c9-7ee6447934af" xlink:to="loc_dei_LegalEntityAxis_4f7aeb85-caf7-45c3-ad75-fa3f23946487" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_4f7aeb85-caf7-45c3-ad75-fa3f23946487_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_4f7aeb85-caf7-45c3-ad75-fa3f23946487" xlink:to="loc_dei_EntityDomain_4f7aeb85-caf7-45c3-ad75-fa3f23946487_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_71461994-a7ae-4c22-ae65-45039ec25fd4" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_4f7aeb85-caf7-45c3-ad75-fa3f23946487" xlink:to="loc_dei_EntityDomain_71461994-a7ae-4c22-ae65-45039ec25fd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_524dc137-9ffd-46ed-95a3-d5bfec6bcacd" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_71461994-a7ae-4c22-ae65-45039ec25fd4" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_524dc137-9ffd-46ed-95a3-d5bfec6bcacd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CactusIIPipelineLLCMember_b106c7a1-e4a1-4ff8-929a-adf088d74fdd" xlink:href="paa-20221231.xsd#paa_CactusIIPipelineLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_71461994-a7ae-4c22-ae65-45039ec25fd4" xlink:to="loc_paa_CactusIIPipelineLLCMember_b106c7a1-e4a1-4ff8-929a-adf088d74fdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_RedRiverPipelineCompanyLLCMember_d29ea91f-01e8-4e46-9d17-81ef44ca6eee" xlink:href="paa-20221231.xsd#paa_RedRiverPipelineCompanyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_71461994-a7ae-4c22-ae65-45039ec25fd4" xlink:to="loc_paa_RedRiverPipelineCompanyLLCMember_d29ea91f-01e8-4e46-9d17-81ef44ca6eee" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/PartnersCapitalandDistributionsContributionsfromNoncontrollingInterestsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#PartnersCapitalandDistributionsContributionsfromNoncontrollingInterestsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/PartnersCapitalandDistributionsContributionsfromNoncontrollingInterestsDetails" xlink:type="extended" id="i0f238f8aa28e4e34b8697307c02373af_PartnersCapitalandDistributionsContributionsfromNoncontrollingInterestsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsLineItems_65829e4e-7143-4c07-9f53-7f614bf8cc8c" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountContributions_f82fe183-3a02-4a34-8d0f-14c473af4dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnersCapitalAccountContributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionsLineItems_65829e4e-7143-4c07-9f53-7f614bf8cc8c" xlink:to="loc_us-gaap_PartnersCapitalAccountContributions_f82fe183-3a02-4a34-8d0f-14c473af4dd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_2360a0da-4a03-4dd0-ac3d-b7a9748bf620" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_PartnersCapitalAndDistributionsLineItems_65829e4e-7143-4c07-9f53-7f614bf8cc8c" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_2360a0da-4a03-4dd0-ac3d-b7a9748bf620" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PartnersCapitalAndDistributionsTable_3642afaa-d6eb-4cbc-a4c7-3a0a038d7a4f" xlink:href="paa-20221231.xsd#paa_PartnersCapitalAndDistributionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_PartnersCapitalAndDistributionsLineItems_65829e4e-7143-4c07-9f53-7f614bf8cc8c" xlink:to="loc_paa_PartnersCapitalAndDistributionsTable_3642afaa-d6eb-4cbc-a4c7-3a0a038d7a4f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_3e86950a-314e-4b47-8458-b40c60ae44b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_3642afaa-d6eb-4cbc-a4c7-3a0a038d7a4f" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_3e86950a-314e-4b47-8458-b40c60ae44b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3e86950a-314e-4b47-8458-b40c60ae44b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3e86950a-314e-4b47-8458-b40c60ae44b5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3e86950a-314e-4b47-8458-b40c60ae44b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_adc1db4b-34bf-48b2-88ea-297b72399e75" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_3e86950a-314e-4b47-8458-b40c60ae44b5" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_adc1db4b-34bf-48b2-88ea-297b72399e75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AdvantagePipelineHoldingsLLCMember_ba13ed9b-a658-408c-afeb-12efd0c102c5" xlink:href="paa-20221231.xsd#paa_AdvantagePipelineHoldingsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_adc1db4b-34bf-48b2-88ea-297b72399e75" xlink:to="loc_paa_AdvantagePipelineHoldingsLLCMember_ba13ed9b-a658-408c-afeb-12efd0c102c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsAxis_efd90a3d-b1eb-41f2-ab05-a643048c8caa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_3642afaa-d6eb-4cbc-a4c7-3a0a038d7a4f" xlink:to="loc_us-gaap_PartnerCapitalComponentsAxis_efd90a3d-b1eb-41f2-ab05-a643048c8caa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_efd90a3d-b1eb-41f2-ab05-a643048c8caa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_efd90a3d-b1eb-41f2-ab05-a643048c8caa" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_efd90a3d-b1eb-41f2-ab05-a643048c8caa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerCapitalComponentsDomain_6455673f-6564-4296-ae30-e44d5d3f4dc1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PartnerCapitalComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerCapitalComponentsAxis_efd90a3d-b1eb-41f2-ab05-a643048c8caa" xlink:to="loc_us-gaap_PartnerCapitalComponentsDomain_6455673f-6564-4296-ae30-e44d5d3f4dc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_4f7eb131-f245-4624-a0f1-46b1884870db" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerCapitalComponentsDomain_6455673f-6564-4296-ae30-e44d5d3f4dc1" xlink:to="loc_us-gaap_NoncontrollingInterestMember_4f7eb131-f245-4624-a0f1-46b1884870db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_dd524d8c-8839-481f-9797-ee6473c9bc45" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_PartnersCapitalAndDistributionsTable_3642afaa-d6eb-4cbc-a4c7-3a0a038d7a4f" xlink:to="loc_dei_LegalEntityAxis_dd524d8c-8839-481f-9797-ee6473c9bc45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_dd524d8c-8839-481f-9797-ee6473c9bc45_default" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_dd524d8c-8839-481f-9797-ee6473c9bc45" xlink:to="loc_dei_EntityDomain_dd524d8c-8839-481f-9797-ee6473c9bc45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_ab2bc7fa-0f06-4496-9cc1-1ad1a56aced0" xlink:href="https://xbrl.sec.gov/dei/2022/dei-2022.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_dd524d8c-8839-481f-9797-ee6473c9bc45" xlink:to="loc_dei_EntityDomain_ab2bc7fa-0f06-4496-9cc1-1ad1a56aced0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsOryxPermianBasinLLCMember_e8a6dc9f-a4ee-4d91-aceb-1dc616957bc2" xlink:href="paa-20221231.xsd#paa_PlainsOryxPermianBasinLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_ab2bc7fa-0f06-4496-9cc1-1ad1a56aced0" xlink:to="loc_paa_PlainsOryxPermianBasinLLCMember_e8a6dc9f-a4ee-4d91-aceb-1dc616957bc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_RedRiverPipelineCompanyLLCMember_04944ace-d804-4b7d-a8df-86af243d78f9" xlink:href="paa-20221231.xsd#paa_RedRiverPipelineCompanyLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_ab2bc7fa-0f06-4496-9cc1-1ad1a56aced0" xlink:to="loc_paa_RedRiverPipelineCompanyLLCMember_04944ace-d804-4b7d-a8df-86af243d78f9" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesCommodityPriceRiskHedgingDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesCommodityPriceRiskHedgingDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesCommodityPriceRiskHedgingDetails" xlink:type="extended" id="ifa1d5233b6ff45609fc1ca4d759e9645_DerivativesandRiskManagementActivitiesCommodityPriceRiskHedgingDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_fa96d262-3b9a-4ae5-806c-acb285c8b2aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PriceRiskDerivativesAbstract_d26b67d4-4c8f-4099-a44e-f2d1571249ff" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PriceRiskDerivativesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_fa96d262-3b9a-4ae5-806c-acb285c8b2aa" xlink:to="loc_us-gaap_PriceRiskDerivativesAbstract_d26b67d4-4c8f-4099-a44e-f2d1571249ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_56cb2941-4bbe-4888-b947-151e2d862eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountVolume"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PriceRiskDerivativesAbstract_d26b67d4-4c8f-4099-a44e-f2d1571249ff" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_56cb2941-4bbe-4888-b947-151e2d862eb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_dcfc6297-6285-4b8d-96d1-241ab205909d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PriceRiskDerivativesAbstract_d26b67d4-4c8f-4099-a44e-f2d1571249ff" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure_dcfc6297-6285-4b8d-96d1-241ab205909d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_581d5360-610a-4454-8a68-4ecf5843499f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_fa96d262-3b9a-4ae5-806c-acb285c8b2aa" xlink:to="loc_us-gaap_DerivativeTable_581d5360-610a-4454-8a68-4ecf5843499f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_a491569c-5048-40f3-8480-a59ee0f1837b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_581d5360-610a-4454-8a68-4ecf5843499f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_a491569c-5048-40f3-8480-a59ee0f1837b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_a491569c-5048-40f3-8480-a59ee0f1837b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_a491569c-5048-40f3-8480-a59ee0f1837b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_a491569c-5048-40f3-8480-a59ee0f1837b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_cfe25810-766a-45e0-9632-2c16e4f59844" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_a491569c-5048-40f3-8480-a59ee0f1837b" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_cfe25810-766a-45e0-9632-2c16e4f59844" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_cfe25810-766a-45e0-9632-2c16e4f59844" xlink:to="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilDerivativeContractsMember_ac0ff60b-f7e8-4d1a-ab31-850895df6940" xlink:href="paa-20221231.xsd#paa_CrudeOilDerivativeContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_CrudeOilDerivativeContractsMember_ac0ff60b-f7e8-4d1a-ab31-850895df6940" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_TimeSpreadOnHedgeAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember_c8585933-0a79-42e3-bcd5-79f63bade934" xlink:href="paa-20221231.xsd#paa_TimeSpreadOnHedgeAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_TimeSpreadOnHedgeAnticipatedCrudeOilLeaseGatheringPurchaseContractsMember_c8585933-0a79-42e3-bcd5-79f63bade934" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilGradeBasisPositionMember_e6811b52-93c2-44d5-9d60-099bcb68f2ae" xlink:href="paa-20221231.xsd#paa_CrudeOilGradeBasisPositionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_CrudeOilGradeBasisPositionMember_e6811b52-93c2-44d5-9d60-099bcb68f2ae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AnticipatedNetSalesOfInventoryMember_657444ee-9a6c-407c-a784-9d8dd4c283ad" xlink:href="paa-20221231.xsd#paa_AnticipatedNetSalesOfInventoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_AnticipatedNetSalesOfInventoryMember_657444ee-9a6c-407c-a784-9d8dd4c283ad" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NaturalGasContractsMember_924fafae-4e77-4df0-9e36-7b597d355f26" xlink:href="paa-20221231.xsd#paa_NaturalGasContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_NaturalGasContractsMember_924fafae-4e77-4df0-9e36-7b597d355f26" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PropaneContractsRelatedToSubsequentSaleOfProductMember_60ba5387-436a-4cdc-bc8c-2be8a1e2581c" xlink:href="paa-20221231.xsd#paa_PropaneContractsRelatedToSubsequentSaleOfProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_PropaneContractsRelatedToSubsequentSaleOfProductMember_60ba5387-436a-4cdc-bc8c-2be8a1e2581c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ButaneContractsRelatedToSubsequentSaleOfProductMember_18aa355a-186c-456d-a550-f30b83c8ba1d" xlink:href="paa-20221231.xsd#paa_ButaneContractsRelatedToSubsequentSaleOfProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_ButaneContractsRelatedToSubsequentSaleOfProductMember_18aa355a-186c-456d-a550-f30b83c8ba1d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CondensateContractsRelatedToSubsequentSaleOfProductMember_147cc5fd-deec-4b47-9183-494cc0c96761" xlink:href="paa-20221231.xsd#paa_CondensateContractsRelatedToSubsequentSaleOfProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_CondensateContractsRelatedToSubsequentSaleOfProductMember_147cc5fd-deec-4b47-9183-494cc0c96761" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_FuelGasRequirementsContractsMember_ee894e28-9440-404d-bcfb-56495e1ff254" xlink:href="paa-20221231.xsd#paa_FuelGasRequirementsContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_FuelGasRequirementsContractsMember_ee894e28-9440-404d-bcfb-56495e1ff254" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PowerSupplyRequirementsContractsMember_048c56d3-f54d-4286-b64e-1a70289a027d" xlink:href="paa-20221231.xsd#paa_PowerSupplyRequirementsContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommodityContractMember_1a11b44a-2ef2-40dc-9c92-417ae8fea7dc" xlink:to="loc_paa_PowerSupplyRequirementsContractsMember_048c56d3-f54d-4286-b64e-1a70289a027d" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionAxis_71e7e323-8aa5-4921-8fcd-f621aa25cd16" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PositionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_581d5360-610a-4454-8a68-4ecf5843499f" xlink:to="loc_us-gaap_PositionAxis_71e7e323-8aa5-4921-8fcd-f621aa25cd16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionDomain_71e7e323-8aa5-4921-8fcd-f621aa25cd16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PositionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PositionAxis_71e7e323-8aa5-4921-8fcd-f621aa25cd16" xlink:to="loc_us-gaap_PositionDomain_71e7e323-8aa5-4921-8fcd-f621aa25cd16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PositionDomain_b51b882b-cb9e-4e48-9af6-ee2e3f61bdc7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PositionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PositionAxis_71e7e323-8aa5-4921-8fcd-f621aa25cd16" xlink:to="loc_us-gaap_PositionDomain_b51b882b-cb9e-4e48-9af6-ee2e3f61bdc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongMember_b4df879a-c0d9-46c4-bf20-4d394cf70c41" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LongMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PositionDomain_b51b882b-cb9e-4e48-9af6-ee2e3f61bdc7" xlink:to="loc_us-gaap_LongMember_b4df879a-c0d9-46c4-bf20-4d394cf70c41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortMember_9f6b019d-6418-458d-836a-579dcb5431da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PositionDomain_b51b882b-cb9e-4e48-9af6-ee2e3f61bdc7" xlink:to="loc_us-gaap_ShortMember_9f6b019d-6418-458d-836a-579dcb5431da" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesFinancialImpactDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesFinancialImpactDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesFinancialImpactDetails" xlink:type="extended" id="i7218bef607ef4725bba06bed8d2169f8_DerivativesandRiskManagementActivitiesFinancialImpactDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_43cc61e9-609f-454c-b0dd-973196b89cfb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_73107f0b-35cc-44ce-88f6-eb1f7740dd99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_43cc61e9-609f-454c-b0dd-973196b89cfb" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_73107f0b-35cc-44ce-88f6-eb1f7740dd99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b42b011f-10eb-4f8c-ab2f-8538ba80ce7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_43cc61e9-609f-454c-b0dd-973196b89cfb" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b42b011f-10eb-4f8c-ab2f-8538ba80ce7a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_eb27900e-b45e-4c59-b057-ddf0dda3b26d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b42b011f-10eb-4f8c-ab2f-8538ba80ce7a" xlink:to="loc_us-gaap_HedgingDesignationAxis_eb27900e-b45e-4c59-b057-ddf0dda3b26d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_eb27900e-b45e-4c59-b057-ddf0dda3b26d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_eb27900e-b45e-4c59-b057-ddf0dda3b26d" xlink:to="loc_us-gaap_HedgingDesignationDomain_eb27900e-b45e-4c59-b057-ddf0dda3b26d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_d032396b-562b-4948-b1bb-785969c3d42a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_eb27900e-b45e-4c59-b057-ddf0dda3b26d" xlink:to="loc_us-gaap_HedgingDesignationDomain_d032396b-562b-4948-b1bb-785969c3d42a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_ad0d286e-7a5e-499f-9b38-09e062a0ddfd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_d032396b-562b-4948-b1bb-785969c3d42a" xlink:to="loc_us-gaap_NondesignatedMember_ad0d286e-7a5e-499f-9b38-09e062a0ddfd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_c19506da-ab96-431c-8ff1-ee9c59be1e7d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b42b011f-10eb-4f8c-ab2f-8538ba80ce7a" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_c19506da-ab96-431c-8ff1-ee9c59be1e7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_c19506da-ab96-431c-8ff1-ee9c59be1e7d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_c19506da-ab96-431c-8ff1-ee9c59be1e7d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_c19506da-ab96-431c-8ff1-ee9c59be1e7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_79b4fdce-fd7e-46ad-99f3-a6ebf1d174b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_c19506da-ab96-431c-8ff1-ee9c59be1e7d" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_79b4fdce-fd7e-46ad-99f3-a6ebf1d174b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_44c60bfb-2785-4922-8e69-e3ba21885f09" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_79b4fdce-fd7e-46ad-99f3-a6ebf1d174b2" xlink:to="loc_us-gaap_CommodityContractMember_44c60bfb-2785-4922-8e69-e3ba21885f09" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_d63dc075-6afe-462f-86ac-84d5e1a0edeb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b42b011f-10eb-4f8c-ab2f-8538ba80ce7a" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_d63dc075-6afe-462f-86ac-84d5e1a0edeb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_d63dc075-6afe-462f-86ac-84d5e1a0edeb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d63dc075-6afe-462f-86ac-84d5e1a0edeb" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_d63dc075-6afe-462f-86ac-84d5e1a0edeb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3b6ff15d-b20b-4fe3-8c77-2ddf8965f438" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d63dc075-6afe-462f-86ac-84d5e1a0edeb" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3b6ff15d-b20b-4fe3-8c77-2ddf8965f438" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_9b09b45e-7fd7-484c-9764-f9dea8f7e672" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3b6ff15d-b20b-4fe3-8c77-2ddf8965f438" xlink:to="loc_us-gaap_ProductMember_9b09b45e-7fd7-484c-9764-f9dea8f7e672" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_FieldOperatingCostsMember_a2d29f61-7314-447f-88cc-40020a68b6e1" xlink:href="paa-20221231.xsd#paa_FieldOperatingCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3b6ff15d-b20b-4fe3-8c77-2ddf8965f438" xlink:to="loc_paa_FieldOperatingCostsMember_a2d29f61-7314-447f-88cc-40020a68b6e1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesBrokerReceivablePayableDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesBrokerReceivablePayableDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesBrokerReceivablePayableDetails" xlink:type="extended" id="i3c016d4f66cf425a97d931fb90a1008c_DerivativesandRiskManagementActivitiesBrokerReceivablePayableDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_13dd21a3-68d7-4c3a-aa33-b4426bd57a30" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InitialMargin_719dcd36-b3dc-45f2-81c4-4e97226150c5" xlink:href="paa-20221231.xsd#paa_InitialMargin"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_13dd21a3-68d7-4c3a-aa33-b4426bd57a30" xlink:to="loc_paa_InitialMargin_719dcd36-b3dc-45f2-81c4-4e97226150c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_VariationMarginPostedReturned_0104aad4-0547-4aef-8750-1b435b6d96ac" xlink:href="paa-20221231.xsd#paa_VariationMarginPostedReturned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_13dd21a3-68d7-4c3a-aa33-b4426bd57a30" xlink:to="loc_paa_VariationMarginPostedReturned_0104aad4-0547-4aef-8750-1b435b6d96ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_6e1f8fd8-a670-4fb8-af5d-e8aa92147e91" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_13dd21a3-68d7-4c3a-aa33-b4426bd57a30" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_6e1f8fd8-a670-4fb8-af5d-e8aa92147e91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_e044123b-2121-4827-8544-3d63ccdc9ac5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_13dd21a3-68d7-4c3a-aa33-b4426bd57a30" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_e044123b-2121-4827-8544-3d63ccdc9ac5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_0e6bfc13-31f2-4af5-8f17-58540aba16d5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_13dd21a3-68d7-4c3a-aa33-b4426bd57a30" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_0e6bfc13-31f2-4af5-8f17-58540aba16d5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_27a583ac-1f4f-45c3-a733-07850305801a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_13dd21a3-68d7-4c3a-aa33-b4426bd57a30" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_27a583ac-1f4f-45c3-a733-07850305801a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionTypeAxis_ccc29b97-282b-4103-a6b7-104e2bd0f9aa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_27a583ac-1f4f-45c3-a733-07850305801a" xlink:to="loc_us-gaap_TransactionTypeAxis_ccc29b97-282b-4103-a6b7-104e2bd0f9aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_ccc29b97-282b-4103-a6b7-104e2bd0f9aa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TransactionTypeAxis_ccc29b97-282b-4103-a6b7-104e2bd0f9aa" xlink:to="loc_us-gaap_TransactionDomain_ccc29b97-282b-4103-a6b7-104e2bd0f9aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransactionDomain_e4d825f1-f0c9-4bd1-95b4-fff8243cfc2b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_TransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TransactionTypeAxis_ccc29b97-282b-4103-a6b7-104e2bd0f9aa" xlink:to="loc_us-gaap_TransactionDomain_e4d825f1-f0c9-4bd1-95b4-fff8243cfc2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExchangeTradedMember_6623ce60-c938-4fbb-ba12-b9327381e843" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ExchangeTradedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransactionDomain_e4d825f1-f0c9-4bd1-95b4-fff8243cfc2b" xlink:to="loc_us-gaap_ExchangeTradedMember_6623ce60-c938-4fbb-ba12-b9327381e843" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesOffsettingAssetandLiabilitiesDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesOffsettingAssetandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesOffsettingAssetandLiabilitiesDetails" xlink:type="extended" id="i189e74bf0daf4d54acb83d980293696e_DerivativesandRiskManagementActivitiesOffsettingAssetandLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_paa_OffsettingAssetsLiabilitiesLineItems_33d39497-e5b0-43da-a765-3616ff5f8f00" xlink:href="paa-20221231.xsd#paa_OffsettingAssetsLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffsettingAbstract_e7e3fd18-16b7-491c-8e87-30a1c1350b26" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OffsettingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_OffsettingAssetsLiabilitiesLineItems_33d39497-e5b0-43da-a765-3616ff5f8f00" xlink:to="loc_us-gaap_OffsettingAbstract_e7e3fd18-16b7-491c-8e87-30a1c1350b26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffsettingDerivativeAssetsAbstract_8ba2bd8d-3779-436e-bc20-0a91cb6ebfeb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OffsettingDerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAbstract_e7e3fd18-16b7-491c-8e87-30a1c1350b26" xlink:to="loc_us-gaap_OffsettingDerivativeAssetsAbstract_8ba2bd8d-3779-436e-bc20-0a91cb6ebfeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_1876e998-8cac-4960-9b0e-e4c96d0497d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_8ba2bd8d-3779-436e-bc20-0a91cb6ebfeb" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_1876e998-8cac-4960-9b0e-e4c96d0497d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiability_b1a6f500-f5c1-4d13-a74f-e37f25073374" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetFairValueGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_8ba2bd8d-3779-436e-bc20-0a91cb6ebfeb" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiability_b1a6f500-f5c1-4d13-a74f-e37f25073374" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_b6120d75-48b8-4865-b7ea-6e03348b6e9d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_8ba2bd8d-3779-436e-bc20-0a91cb6ebfeb" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_b6120d75-48b8-4865-b7ea-6e03348b6e9d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_1ff163ef-5523-44a0-b7c4-adbe5c161cf3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeAssetsAbstract_8ba2bd8d-3779-436e-bc20-0a91cb6ebfeb" xlink:to="loc_us-gaap_DerivativeAssets_1ff163ef-5523-44a0-b7c4-adbe5c161cf3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_d8badc8a-c6c0-40cd-9639-2043e32660b2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OffsettingDerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAbstract_e7e3fd18-16b7-491c-8e87-30a1c1350b26" xlink:to="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_d8badc8a-c6c0-40cd-9639-2043e32660b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_d2ed0736-f6d0-4358-ad78-7de82ee49f29" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilityFairValueGrossAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_d8badc8a-c6c0-40cd-9639-2043e32660b2" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAsset_d2ed0736-f6d0-4358-ad78-7de82ee49f29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_48285fa7-006b-4022-aa27-bdadde28059b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_d8badc8a-c6c0-40cd-9639-2043e32660b2" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_48285fa7-006b-4022-aa27-bdadde28059b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_001fe4fc-49c6-4459-9f65-75b7411d3d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_d8badc8a-c6c0-40cd-9639-2043e32660b2" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_001fe4fc-49c6-4459-9f65-75b7411d3d2e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_5d8cb388-2b94-4989-b1ca-17b73f9d13a7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingDerivativeLiabilitiesAbstract_d8badc8a-c6c0-40cd-9639-2043e32660b2" xlink:to="loc_us-gaap_DerivativeLiabilities_5d8cb388-2b94-4989-b1ca-17b73f9d13a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_93ef6bd3-f0e3-4456-bb83-dff0c6c55aae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OffsettingAbstract_e7e3fd18-16b7-491c-8e87-30a1c1350b26" xlink:to="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_93ef6bd3-f0e3-4456-bb83-dff0c6c55aae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OffsettingAssetsLiabilitiesTable_9b5b0232-6820-41e3-a8f7-77b67d7bb774" xlink:href="paa-20221231.xsd#paa_OffsettingAssetsLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_paa_OffsettingAssetsLiabilitiesLineItems_33d39497-e5b0-43da-a765-3616ff5f8f00" xlink:to="loc_paa_OffsettingAssetsLiabilitiesTable_9b5b0232-6820-41e3-a8f7-77b67d7bb774" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_f2993e7d-8f5b-4553-8ba6-55d612ca8110" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_OffsettingAssetsLiabilitiesTable_9b5b0232-6820-41e3-a8f7-77b67d7bb774" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_f2993e7d-8f5b-4553-8ba6-55d612ca8110" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_f2993e7d-8f5b-4553-8ba6-55d612ca8110_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_f2993e7d-8f5b-4553-8ba6-55d612ca8110" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_f2993e7d-8f5b-4553-8ba6-55d612ca8110_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_eeffdb8d-33f4-4954-bf4c-ce8aead5d18e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_f2993e7d-8f5b-4553-8ba6-55d612ca8110" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_eeffdb8d-33f4-4954-bf4c-ce8aead5d18e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_e1ecfe72-21e4-4862-aa89-16faf150aba5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_eeffdb8d-33f4-4954-bf4c-ce8aead5d18e" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_e1ecfe72-21e4-4862-aa89-16faf150aba5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_b6de99fa-3c84-4826-bd3d-58f8cf916426" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_eeffdb8d-33f4-4954-bf4c-ce8aead5d18e" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_b6de99fa-3c84-4826-bd3d-58f8cf916426" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_ffc56cc0-ad1b-49d9-98ed-8c610c596ede" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_eeffdb8d-33f4-4954-bf4c-ce8aead5d18e" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_ffc56cc0-ad1b-49d9-98ed-8c610c596ede" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_07f8096b-27a0-4ded-a5c0-d1e4913e5748" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_eeffdb8d-33f4-4954-bf4c-ce8aead5d18e" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_07f8096b-27a0-4ded-a5c0-d1e4913e5748" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_105956bf-6d5d-4c50-991f-f50c94276322" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_paa_OffsettingAssetsLiabilitiesTable_9b5b0232-6820-41e3-a8f7-77b67d7bb774" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_105956bf-6d5d-4c50-991f-f50c94276322" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_105956bf-6d5d-4c50-991f-f50c94276322_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_105956bf-6d5d-4c50-991f-f50c94276322" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_105956bf-6d5d-4c50-991f-f50c94276322_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_78a7598c-f556-4a53-9a3a-6ce324187d34" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_105956bf-6d5d-4c50-991f-f50c94276322" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_78a7598c-f556-4a53-9a3a-6ce324187d34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_ab63fb83-8059-4d25-9fc2-ca1fa609f09b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_78a7598c-f556-4a53-9a3a-6ce324187d34" xlink:to="loc_us-gaap_CommodityContractMember_ab63fb83-8059-4d25-9fc2-ca1fa609f09b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesInterestRateRiskHedgingDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesInterestRateRiskHedgingDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesInterestRateRiskHedgingDetails" xlink:type="extended" id="ia40a01da669346388de45f92854061fe_DerivativesandRiskManagementActivitiesInterestRateRiskHedgingDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_cce9a503-2f15-4bf1-b511-00ae0ce9455a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateDerivativesAbstract_3cddcdcc-c18e-42d9-b543-5dd9176951e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateDerivativesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_cce9a503-2f15-4bf1-b511-00ae0ce9455a" xlink:to="loc_us-gaap_InterestRateDerivativesAbstract_3cddcdcc-c18e-42d9-b543-5dd9176951e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfInterestRateDerivativesHeld_2037cae2-c265-4258-b209-b3e3802d9125" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NumberOfInterestRateDerivativesHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateDerivativesAbstract_3cddcdcc-c18e-42d9-b543-5dd9176951e2" xlink:to="loc_us-gaap_NumberOfInterestRateDerivativesHeld_2037cae2-c265-4258-b209-b3e3802d9125" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_9e377a1b-dbe5-4ab0-a653-3f928f46e0e3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateDerivativesAbstract_3cddcdcc-c18e-42d9-b543-5dd9176951e2" xlink:to="loc_us-gaap_DerivativeTermOfContract_9e377a1b-dbe5-4ab0-a653-3f928f46e0e3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_e41f735e-e896-4019-8509-7f8a0a6985cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateDerivativesAbstract_3cddcdcc-c18e-42d9-b543-5dd9176951e2" xlink:to="loc_us-gaap_DerivativeNotionalAmount_e41f735e-e896-4019-8509-7f8a0a6985cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAverageFixedInterestRate_d5dfb9bd-4b03-4811-98e1-fa6a7487345d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeAverageFixedInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateDerivativesAbstract_3cddcdcc-c18e-42d9-b543-5dd9176951e2" xlink:to="loc_us-gaap_DerivativeAverageFixedInterestRate_d5dfb9bd-4b03-4811-98e1-fa6a7487345d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_874363a9-a16b-4bc3-a1fa-bf0937ec2172" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_cce9a503-2f15-4bf1-b511-00ae0ce9455a" xlink:to="loc_us-gaap_DerivativeTable_874363a9-a16b-4bc3-a1fa-bf0937ec2172" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_0ddebdf0-0999-4661-8573-96b4bc086fec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_874363a9-a16b-4bc3-a1fa-bf0937ec2172" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_0ddebdf0-0999-4661-8573-96b4bc086fec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_0ddebdf0-0999-4661-8573-96b4bc086fec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_0ddebdf0-0999-4661-8573-96b4bc086fec" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_0ddebdf0-0999-4661-8573-96b4bc086fec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_25aa9e35-e28c-4883-b77a-83ab4804681d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_0ddebdf0-0999-4661-8573-96b4bc086fec" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_25aa9e35-e28c-4883-b77a-83ab4804681d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_2fd4edc0-4767-4754-9687-dba2eecb7122" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_25aa9e35-e28c-4883-b77a-83ab4804681d" xlink:to="loc_us-gaap_InterestRateContractMember_2fd4edc0-4767-4754-9687-dba2eecb7122" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EightForwardStartingThirtyYearInterestRateSwaps138PercentMember_aa4ee866-1d4e-47b3-b4b0-c380bd343f82" xlink:href="paa-20221231.xsd#paa_EightForwardStartingThirtyYearInterestRateSwaps138PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateContractMember_2fd4edc0-4767-4754-9687-dba2eecb7122" xlink:to="loc_paa_EightForwardStartingThirtyYearInterestRateSwaps138PercentMember_aa4ee866-1d4e-47b3-b4b0-c380bd343f82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EightForwardStartingThirtyYearInterestRateSwaps074PercentMember_48423c41-4c44-4f22-92ff-18d8110125f3" xlink:href="paa-20221231.xsd#paa_EightForwardStartingThirtyYearInterestRateSwaps074PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestRateContractMember_2fd4edc0-4767-4754-9687-dba2eecb7122" xlink:to="loc_paa_EightForwardStartingThirtyYearInterestRateSwaps074PercentMember_48423c41-4c44-4f22-92ff-18d8110125f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_73dda0db-bbc6-4671-a572-7925e8422cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_874363a9-a16b-4bc3-a1fa-bf0937ec2172" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_73dda0db-bbc6-4671-a572-7925e8422cdc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_73dda0db-bbc6-4671-a572-7925e8422cdc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_73dda0db-bbc6-4671-a572-7925e8422cdc" xlink:to="loc_us-gaap_HedgingRelationshipDomain_73dda0db-bbc6-4671-a572-7925e8422cdc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_ab5eda3a-dd70-4493-8a14-c74a36fe1190" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_73dda0db-bbc6-4671-a572-7925e8422cdc" xlink:to="loc_us-gaap_HedgingRelationshipDomain_ab5eda3a-dd70-4493-8a14-c74a36fe1190" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_05b5e672-b19b-4fb4-8f01-652e2b7af90a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_ab5eda3a-dd70-4493-8a14-c74a36fe1190" xlink:to="loc_us-gaap_CashFlowHedgingMember_05b5e672-b19b-4fb4-8f01-652e2b7af90a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesNetUnrealizedGainLossRecognizedinAOCIDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesNetUnrealizedGainLossRecognizedinAOCIDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesNetUnrealizedGainLossRecognizedinAOCIDetails" xlink:type="extended" id="i1b05471a0ba249efbd5db59a231f2738_DerivativesandRiskManagementActivitiesNetUnrealizedGainLossRecognizedinAOCIDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_da75dd26-1164-4759-8ac9-cdfbb6084399" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_44666eff-fc40-4582-8282-5d616f75d21c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da75dd26-1164-4759-8ac9-cdfbb6084399" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_44666eff-fc40-4582-8282-5d616f75d21c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_9d4dc72b-50c4-49e7-a5c9-f4fdb2174f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da75dd26-1164-4759-8ac9-cdfbb6084399" xlink:to="loc_us-gaap_DerivativeNotionalAmount_9d4dc72b-50c4-49e7-a5c9-f4fdb2174f7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NetCashPaidReceivedforTerminatedHedgingInstruments_5a57a65d-d5f2-4e4a-b8a5-287707b2c3fe" xlink:href="paa-20221231.xsd#paa_NetCashPaidReceivedforTerminatedHedgingInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da75dd26-1164-4759-8ac9-cdfbb6084399" xlink:to="loc_paa_NetCashPaidReceivedforTerminatedHedgingInstruments_5a57a65d-d5f2-4e4a-b8a5-287707b2c3fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_6631c96b-893a-4287-8f55-40313d5394fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da75dd26-1164-4759-8ac9-cdfbb6084399" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_6631c96b-893a-4287-8f55-40313d5394fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateFairValueHedgeLiabilityAtFairValue_130f4cbf-030c-4e93-8430-e35c829df10e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateFairValueHedgeLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da75dd26-1164-4759-8ac9-cdfbb6084399" xlink:to="loc_us-gaap_InterestRateFairValueHedgeLiabilityAtFairValue_130f4cbf-030c-4e93-8430-e35c829df10e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_419ec899-bbc9-40c5-a397-e07b0edfed59" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_da75dd26-1164-4759-8ac9-cdfbb6084399" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_419ec899-bbc9-40c5-a397-e07b0edfed59" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_e8312d9d-5e81-4d56-bba6-928a2da5711f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_419ec899-bbc9-40c5-a397-e07b0edfed59" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_e8312d9d-5e81-4d56-bba6-928a2da5711f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_e8312d9d-5e81-4d56-bba6-928a2da5711f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e8312d9d-5e81-4d56-bba6-928a2da5711f" xlink:to="loc_us-gaap_EquityComponentDomain_e8312d9d-5e81-4d56-bba6-928a2da5711f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_25e8236e-9559-49fa-95a4-f33efb4e9372" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_e8312d9d-5e81-4d56-bba6-928a2da5711f" xlink:to="loc_us-gaap_EquityComponentDomain_25e8236e-9559-49fa-95a4-f33efb4e9372" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_45e9bfef-be8d-4d12-aaeb-e901ddc1c2c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_25e8236e-9559-49fa-95a4-f33efb4e9372" xlink:to="loc_us-gaap_AccumulatedGainLossCashFlowHedgeIncludingNoncontrollingInterestMember_45e9bfef-be8d-4d12-aaeb-e901ddc1c2c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_6503e079-9195-45cf-a5bf-2e3dc7f25f3a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_419ec899-bbc9-40c5-a397-e07b0edfed59" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_6503e079-9195-45cf-a5bf-2e3dc7f25f3a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_6503e079-9195-45cf-a5bf-2e3dc7f25f3a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_6503e079-9195-45cf-a5bf-2e3dc7f25f3a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_6503e079-9195-45cf-a5bf-2e3dc7f25f3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_ab786c0c-8581-4d5b-aeca-ee68894125e4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_6503e079-9195-45cf-a5bf-2e3dc7f25f3a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_ab786c0c-8581-4d5b-aeca-ee68894125e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InterestRateSwapsTerminatedMember_dc5cba70-7668-47f2-b4c7-0efd5b7fe924" xlink:href="paa-20221231.xsd#paa_InterestRateSwapsTerminatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_ab786c0c-8581-4d5b-aeca-ee68894125e4" xlink:to="loc_paa_InterestRateSwapsTerminatedMember_dc5cba70-7668-47f2-b4c7-0efd5b7fe924" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_8812c289-481b-4161-bb64-1a14765fd24a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_ab786c0c-8581-4d5b-aeca-ee68894125e4" xlink:to="loc_us-gaap_InterestRateContractMember_8812c289-481b-4161-bb64-1a14765fd24a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_792c7ebe-d94a-4ac4-8817-e950475a8618" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_419ec899-bbc9-40c5-a397-e07b0edfed59" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_792c7ebe-d94a-4ac4-8817-e950475a8618" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_792c7ebe-d94a-4ac4-8817-e950475a8618_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_792c7ebe-d94a-4ac4-8817-e950475a8618" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_792c7ebe-d94a-4ac4-8817-e950475a8618_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_a713cf29-a803-444a-95f3-c2b99c517a95" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_792c7ebe-d94a-4ac4-8817-e950475a8618" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_a713cf29-a803-444a-95f3-c2b99c517a95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_2e134cd2-913b-4433-bf10-b3106386b172" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a713cf29-a803-444a-95f3-c2b99c517a95" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_2e134cd2-913b-4433-bf10-b3106386b172" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_d7b9e523-deae-4808-8854-0bcffa005b09" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_a713cf29-a803-444a-95f3-c2b99c517a95" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_d7b9e523-deae-4808-8854-0bcffa005b09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_51eee06c-cef0-4bb2-8afc-3e8c358a91af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_419ec899-bbc9-40c5-a397-e07b0edfed59" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_51eee06c-cef0-4bb2-8afc-3e8c358a91af" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_51eee06c-cef0-4bb2-8afc-3e8c358a91af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_51eee06c-cef0-4bb2-8afc-3e8c358a91af" xlink:to="loc_us-gaap_HedgingRelationshipDomain_51eee06c-cef0-4bb2-8afc-3e8c358a91af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_1737acf1-9dc3-48aa-a42e-8e44801d34bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_51eee06c-cef0-4bb2-8afc-3e8c358a91af" xlink:to="loc_us-gaap_HedgingRelationshipDomain_1737acf1-9dc3-48aa-a42e-8e44801d34bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_f2cca68a-b5ec-4be4-8da4-b8baf9da41c5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_1737acf1-9dc3-48aa-a42e-8e44801d34bc" xlink:to="loc_us-gaap_CashFlowHedgingMember_f2cca68a-b5ec-4be4-8da4-b8baf9da41c5" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesPreferredDistributionRateDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesPreferredDistributionRateDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesPreferredDistributionRateDetails" xlink:type="extended" id="i2502f9003f774774813ef0d4fa99a05c_DerivativesandRiskManagementActivitiesPreferredDistributionRateDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_fa434d10-61de-49c6-b49a-ea9e80720459" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_1e33219a-cd03-4462-ace4-ee95bf523a3a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_fa434d10-61de-49c6-b49a-ea9e80720459" xlink:to="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_1e33219a-cd03-4462-ace4-ee95bf523a3a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_d6034654-fb09-44a0-bab0-b11250999850" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_fa434d10-61de-49c6-b49a-ea9e80720459" xlink:to="loc_us-gaap_DerivativeLiabilities_d6034654-fb09-44a0-bab0-b11250999850" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_e853191d-c410-4c48-80cb-a5c6bb2e385d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilities_d6034654-fb09-44a0-bab0-b11250999850" xlink:to="loc_us-gaap_DerivativeLiabilityStatementOfFinancialPositionExtensibleEnumeration_e853191d-c410-4c48-80cb-a5c6bb2e385d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_c3ddc540-824e-4c51-8950-41b930da60be" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_fa434d10-61de-49c6-b49a-ea9e80720459" xlink:to="loc_us-gaap_DerivativeTable_c3ddc540-824e-4c51-8950-41b930da60be" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_1bf96ebb-bbe4-4d98-a8ed-616a66ea9b06" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_c3ddc540-824e-4c51-8950-41b930da60be" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_1bf96ebb-bbe4-4d98-a8ed-616a66ea9b06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_1bf96ebb-bbe4-4d98-a8ed-616a66ea9b06_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_1bf96ebb-bbe4-4d98-a8ed-616a66ea9b06" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_1bf96ebb-bbe4-4d98-a8ed-616a66ea9b06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_61a06b27-241c-4cd9-8648-21517d1f0035" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_1bf96ebb-bbe4-4d98-a8ed-616a66ea9b06" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_61a06b27-241c-4cd9-8648-21517d1f0035" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_c1124531-6a6a-4fff-a5cd-12368fffc9cc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_61a06b27-241c-4cd9-8648-21517d1f0035" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_c1124531-6a6a-4fff-a5cd-12368fffc9cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_b0270b97-4498-43ee-80ec-d2297c134f3c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_c3ddc540-824e-4c51-8950-41b930da60be" xlink:to="loc_us-gaap_HedgingDesignationAxis_b0270b97-4498-43ee-80ec-d2297c134f3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_b0270b97-4498-43ee-80ec-d2297c134f3c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_b0270b97-4498-43ee-80ec-d2297c134f3c" xlink:to="loc_us-gaap_HedgingDesignationDomain_b0270b97-4498-43ee-80ec-d2297c134f3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_3a863446-789f-4d21-84d4-eb6d8d8cc9ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_b0270b97-4498-43ee-80ec-d2297c134f3c" xlink:to="loc_us-gaap_HedgingDesignationDomain_3a863446-789f-4d21-84d4-eb6d8d8cc9ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_8da52d6c-ec82-4994-871b-58f2625a152b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_3a863446-789f-4d21-84d4-eb6d8d8cc9ed" xlink:to="loc_us-gaap_NondesignatedMember_8da52d6c-ec82-4994-871b-58f2625a152b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_b84866b7-f21b-4f5b-bfa6-1dad952ad043" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_c3ddc540-824e-4c51-8950-41b930da60be" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_b84866b7-f21b-4f5b-bfa6-1dad952ad043" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_b84866b7-f21b-4f5b-bfa6-1dad952ad043_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_b84866b7-f21b-4f5b-bfa6-1dad952ad043" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_b84866b7-f21b-4f5b-bfa6-1dad952ad043_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_16d54337-e891-4118-afde-54b4364eb988" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_b84866b7-f21b-4f5b-bfa6-1dad952ad043" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_16d54337-e891-4118-afde-54b4364eb988" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_8511d6e2-e22c-4417-abb0-43ca4476669c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNonoperatingIncomeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_16d54337-e891-4118-afde-54b4364eb988" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpenseMember_8511d6e2-e22c-4417-abb0-43ca4476669c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e7a54d1f-bd1e-4cc0-8682-04b662b157dc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_c3ddc540-824e-4c51-8950-41b930da60be" xlink:to="loc_srt_RangeAxis_e7a54d1f-bd1e-4cc0-8682-04b662b157dc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e7a54d1f-bd1e-4cc0-8682-04b662b157dc_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e7a54d1f-bd1e-4cc0-8682-04b662b157dc" xlink:to="loc_srt_RangeMember_e7a54d1f-bd1e-4cc0-8682-04b662b157dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8d1dcac4-0ed2-4f90-8372-4a4fe4027f5b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e7a54d1f-bd1e-4cc0-8682-04b662b157dc" xlink:to="loc_srt_RangeMember_8d1dcac4-0ed2-4f90-8372-4a4fe4027f5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_d8e259c5-4ec0-4a75-8a77-764aa0687cf3" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_8d1dcac4-0ed2-4f90-8372-4a4fe4027f5b" xlink:to="loc_srt_MaximumMember_d8e259c5-4ec0-4a75-8a77-764aa0687cf3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesFairValueDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#DerivativesandRiskManagementActivitiesFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/DerivativesandRiskManagementActivitiesFairValueDetails" xlink:type="extended" id="if9154673c67c42acb746c9752228818d_DerivativesandRiskManagementActivitiesFairValueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7dd0b3e-0806-4e1a-9529-62600ca4329c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_2b34de28-06d5-4042-9ff6-71a5c7f42c2a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7dd0b3e-0806-4e1a-9529-62600ca4329c" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_2b34de28-06d5-4042-9ff6-71a5c7f42c2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_3211ee37-8448-4c47-b703-6918a30f1048" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7dd0b3e-0806-4e1a-9529-62600ca4329c" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_3211ee37-8448-4c47-b703-6918a30f1048" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_58916950-983e-441b-b653-b8873889303a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_3211ee37-8448-4c47-b703-6918a30f1048" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_58916950-983e-441b-b653-b8873889303a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_f9b2a272-9639-4960-ab79-9a22fb366f4a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_3211ee37-8448-4c47-b703-6918a30f1048" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_f9b2a272-9639-4960-ab79-9a22fb366f4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList_4fa5d9c5-e706-42d0-b864-619a4af2dbc7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_f9b2a272-9639-4960-ab79-9a22fb366f4a" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList_4fa5d9c5-e706-42d0-b864-619a4af2dbc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements_0fb201db-87af-4206-9753-97d6eb699c83" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_3211ee37-8448-4c47-b703-6918a30f1048" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements_0fb201db-87af-4206-9753-97d6eb699c83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_d7751866-1747-4ded-9d1c-24fb3d42b637" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_953cdd81-952d-4201-a752-0c76f83407ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7dd0b3e-0806-4e1a-9529-62600ca4329c" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_953cdd81-952d-4201-a752-0c76f83407ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList_c3113cd0-ebca-4deb-8f89-faebcca5fb29" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_953cdd81-952d-4201-a752-0c76f83407ef" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityRecurringBasisStillHeldUnrealizedGainLossStatementOfIncomeExtensibleList_c3113cd0-ebca-4deb-8f89-faebcca5fb29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_97d1da35-1bc4-43fd-9a32-1d40abdecb1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_f7dd0b3e-0806-4e1a-9529-62600ca4329c" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_97d1da35-1bc4-43fd-9a32-1d40abdecb1b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2832bead-8b64-4b44-9724-4f5597aab530" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_97d1da35-1bc4-43fd-9a32-1d40abdecb1b" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2832bead-8b64-4b44-9724-4f5597aab530" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_2832bead-8b64-4b44-9724-4f5597aab530_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2832bead-8b64-4b44-9724-4f5597aab530" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_2832bead-8b64-4b44-9724-4f5597aab530_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_e88672ad-511a-4e45-a33c-6f357005ad93" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2832bead-8b64-4b44-9724-4f5597aab530" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_e88672ad-511a-4e45-a33c-6f357005ad93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_10fdb6e3-6c45-4fd5-ae8a-01e6b28517af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_e88672ad-511a-4e45-a33c-6f357005ad93" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_10fdb6e3-6c45-4fd5-ae8a-01e6b28517af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1c4d95a4-a0c1-4f3f-b26d-4ff5ded6839f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_97d1da35-1bc4-43fd-9a32-1d40abdecb1b" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1c4d95a4-a0c1-4f3f-b26d-4ff5ded6839f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1c4d95a4-a0c1-4f3f-b26d-4ff5ded6839f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1c4d95a4-a0c1-4f3f-b26d-4ff5ded6839f" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1c4d95a4-a0c1-4f3f-b26d-4ff5ded6839f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_47bce4f6-4f30-4057-9539-34c33990f183" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_1c4d95a4-a0c1-4f3f-b26d-4ff5ded6839f" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_47bce4f6-4f30-4057-9539-34c33990f183" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_aa2c7dad-e50f-45ed-8114-444655745891" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_47bce4f6-4f30-4057-9539-34c33990f183" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_aa2c7dad-e50f-45ed-8114-444655745891" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_58b2864d-6c3c-4c93-a361-910df725106c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_47bce4f6-4f30-4057-9539-34c33990f183" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_58b2864d-6c3c-4c93-a361-910df725106c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_81a79592-9f86-4ea4-bbe1-78d43a2d21bc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_47bce4f6-4f30-4057-9539-34c33990f183" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_81a79592-9f86-4ea4-bbe1-78d43a2d21bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_77433ae6-0c3e-4998-958a-b2962971ff35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_97d1da35-1bc4-43fd-9a32-1d40abdecb1b" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_77433ae6-0c3e-4998-958a-b2962971ff35" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_77433ae6-0c3e-4998-958a-b2962971ff35_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_77433ae6-0c3e-4998-958a-b2962971ff35" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_77433ae6-0c3e-4998-958a-b2962971ff35_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_bbdb10a5-19b9-436e-9e16-10531e29274e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_77433ae6-0c3e-4998-958a-b2962971ff35" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_bbdb10a5-19b9-436e-9e16-10531e29274e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_6b5ff492-9abd-451d-bc69-c7fd80677a47" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_bbdb10a5-19b9-436e-9e16-10531e29274e" xlink:to="loc_us-gaap_CommodityContractMember_6b5ff492-9abd-451d-bc69-c7fd80677a47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_9b13423d-dd4d-4f15-bb93-a54e9d84934a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_bbdb10a5-19b9-436e-9e16-10531e29274e" xlink:to="loc_us-gaap_InterestRateContractMember_9b13423d-dd4d-4f15-bb93-a54e9d84934a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_05092f75-be7d-45cb-8cd6-dee946b5e6ed" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_bbdb10a5-19b9-436e-9e16-10531e29274e" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_05092f75-be7d-45cb-8cd6-dee946b5e6ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_b99e3312-84bc-46b9-9338-fd7c29dbc30e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_97d1da35-1bc4-43fd-9a32-1d40abdecb1b" xlink:to="loc_srt_ProductOrServiceAxis_b99e3312-84bc-46b9-9338-fd7c29dbc30e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_b99e3312-84bc-46b9-9338-fd7c29dbc30e_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_b99e3312-84bc-46b9-9338-fd7c29dbc30e" xlink:to="loc_srt_ProductsAndServicesDomain_b99e3312-84bc-46b9-9338-fd7c29dbc30e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_4191b227-dd38-4724-9456-24a2d0acce2c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_b99e3312-84bc-46b9-9338-fd7c29dbc30e" xlink:to="loc_srt_ProductsAndServicesDomain_4191b227-dd38-4724-9456-24a2d0acce2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_781e5238-b004-4ca0-859a-20c7d60f3577" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_4191b227-dd38-4724-9456-24a2d0acce2c" xlink:to="loc_us-gaap_ProductMember_781e5238-b004-4ca0-859a-20c7d60f3577" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/LeasesNarrativeInformationDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#LeasesNarrativeInformationDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/LeasesNarrativeInformationDetails" xlink:type="extended" id="i369a4b1bf3d84bcea5e8a12ad54b31c5_LeasesNarrativeInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_b1e31f77-62b5-41f3-b34d-cdbabe106a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_89901cfc-21cf-471c-ba3d-dff165806091" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_b1e31f77-62b5-41f3-b34d-cdbabe106a8c" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_89901cfc-21cf-471c-ba3d-dff165806091" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LesseeLeasesTermOfContract_b8630bb9-b5e3-4b16-b7c0-114f2bc57eb7" xlink:href="paa-20221231.xsd#paa_LesseeLeasesTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_b1e31f77-62b5-41f3-b34d-cdbabe106a8c" xlink:to="loc_paa_LesseeLeasesTermOfContract_b8630bb9-b5e3-4b16-b7c0-114f2bc57eb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LesseeLeasesRenewalTerm_4d0eff99-2743-44ac-9554-3ab7598b5353" xlink:href="paa-20221231.xsd#paa_LesseeLeasesRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_b1e31f77-62b5-41f3-b34d-cdbabe106a8c" xlink:to="loc_paa_LesseeLeasesRenewalTerm_4d0eff99-2743-44ac-9554-3ab7598b5353" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_2eead9a9-ac7c-4106-bb67-330c63dbe713" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_b1e31f77-62b5-41f3-b34d-cdbabe106a8c" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_2eead9a9-ac7c-4106-bb67-330c63dbe713" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_ab99846f-b859-43aa-9a9d-d07b91c3025d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_2eead9a9-ac7c-4106-bb67-330c63dbe713" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_ab99846f-b859-43aa-9a9d-d07b91c3025d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_ab99846f-b859-43aa-9a9d-d07b91c3025d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_ab99846f-b859-43aa-9a9d-d07b91c3025d" xlink:to="loc_us-gaap_RelatedPartyDomain_ab99846f-b859-43aa-9a9d-d07b91c3025d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_e93c4700-c6c2-4352-b985-1b379af2bd61" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_ab99846f-b859-43aa-9a9d-d07b91c3025d" xlink:to="loc_us-gaap_RelatedPartyDomain_e93c4700-c6c2-4352-b985-1b379af2bd61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_999677b8-d426-4229-a212-83c53928fc80" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_e93c4700-c6c2-4352-b985-1b379af2bd61" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_999677b8-d426-4229-a212-83c53928fc80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_dc0fa5e8-ae59-45ca-ab0d-264fc80ae7b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_2eead9a9-ac7c-4106-bb67-330c63dbe713" xlink:to="loc_us-gaap_OtherCommitmentsAxis_dc0fa5e8-ae59-45ca-ab0d-264fc80ae7b5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_dc0fa5e8-ae59-45ca-ab0d-264fc80ae7b5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_dc0fa5e8-ae59-45ca-ab0d-264fc80ae7b5" xlink:to="loc_us-gaap_OtherCommitmentsDomain_dc0fa5e8-ae59-45ca-ab0d-264fc80ae7b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_a0fa8280-f401-4451-9455-426b3f1c5f96" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_dc0fa5e8-ae59-45ca-ab0d-264fc80ae7b5" xlink:to="loc_us-gaap_OtherCommitmentsDomain_a0fa8280-f401-4451-9455-426b3f1c5f96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_02fb40f4-0d7d-4a91-8a1a-2e269c2b7044" xlink:href="paa-20221231.xsd#paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_a0fa8280-f401-4451-9455-426b3f1c5f96" xlink:to="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_02fb40f4-0d7d-4a91-8a1a-2e269c2b7044" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2e82f70c-992b-4a76-8fb8-cea84902c442" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_2eead9a9-ac7c-4106-bb67-330c63dbe713" xlink:to="loc_srt_RangeAxis_2e82f70c-992b-4a76-8fb8-cea84902c442" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2e82f70c-992b-4a76-8fb8-cea84902c442_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2e82f70c-992b-4a76-8fb8-cea84902c442" xlink:to="loc_srt_RangeMember_2e82f70c-992b-4a76-8fb8-cea84902c442_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_aa566eef-f0fb-40f8-8d7b-dfe1c6f6d333" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2e82f70c-992b-4a76-8fb8-cea84902c442" xlink:to="loc_srt_RangeMember_aa566eef-f0fb-40f8-8d7b-dfe1c6f6d333" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_f8b7d2c1-0d71-40c5-a27a-63dcd911cae4" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aa566eef-f0fb-40f8-8d7b-dfe1c6f6d333" xlink:to="loc_srt_MinimumMember_f8b7d2c1-0d71-40c5-a27a-63dcd911cae4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3d65dc94-c03d-4b3b-9e13-feaec69180ac" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_aa566eef-f0fb-40f8-8d7b-dfe1c6f6d333" xlink:to="loc_srt_MaximumMember_3d65dc94-c03d-4b3b-9e13-feaec69180ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_491e31d8-6c03-44b3-ae8b-1b0add7c91bc" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_2eead9a9-ac7c-4106-bb67-330c63dbe713" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_491e31d8-6c03-44b3-ae8b-1b0add7c91bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_491e31d8-6c03-44b3-ae8b-1b0add7c91bc_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_491e31d8-6c03-44b3-ae8b-1b0add7c91bc" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_491e31d8-6c03-44b3-ae8b-1b0add7c91bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_8863b257-001b-425f-b2ef-8a8ca864b913" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_491e31d8-6c03-44b3-ae8b-1b0add7c91bc" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_8863b257-001b-425f-b2ef-8a8ca864b913" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_ea42747f-ebc3-4d62-ae3f-f14ff019828d" xlink:href="paa-20221231.xsd#paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_8863b257-001b-425f-b2ef-8a8ca864b913" xlink:to="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_ea42747f-ebc3-4d62-ae3f-f14ff019828d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionLineItems_03f0c5fe-d8b8-41d8-b0b8-c4e578be582c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorOperatingLeaseTermOfContract_d1bec67a-35cc-4585-b463-6410cf3b8e5a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_03f0c5fe-d8b8-41d8-b0b8-c4e578be582c" xlink:to="loc_us-gaap_LessorOperatingLeaseTermOfContract_d1bec67a-35cc-4585-b463-6410cf3b8e5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionTable_f07028b5-b69e-4682-b40b-95f3421f8e79" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_03f0c5fe-d8b8-41d8-b0b8-c4e578be582c" xlink:to="loc_us-gaap_LessorLeaseDescriptionTable_f07028b5-b69e-4682-b40b-95f3421f8e79" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_90759583-4647-4300-9bf5-eb685b3cba03" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LessorLeaseDescriptionTable_f07028b5-b69e-4682-b40b-95f3421f8e79" xlink:to="loc_srt_RangeAxis_90759583-4647-4300-9bf5-eb685b3cba03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_90759583-4647-4300-9bf5-eb685b3cba03_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_30d2174b-27ca-4650-ae81-ee493f27eb03" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_434da754-d00b-4c5a-9ec8-6ae1fc4702c5" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_66b1a33f-5826-4194-b27b-f33d29fd949a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/LeasesLeaseCostsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#LeasesLeaseCostsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/LeasesLeaseCostsDetails" xlink:type="extended" id="i4d2bd641260b4746aa15d251243845e9_LeasesLeaseCostsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_437ad8ec-cd5c-4eb8-a2a6-cc04425b062a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_a039dffa-2e35-48a6-8227-29d7c1c953bf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_437ad8ec-cd5c-4eb8-a2a6-cc04425b062a" xlink:to="loc_us-gaap_OperatingLeaseCost_a039dffa-2e35-48a6-8227-29d7c1c953bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_a9b9c320-f329-4968-9155-37e739c01886" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_437ad8ec-cd5c-4eb8-a2a6-cc04425b062a" xlink:to="loc_us-gaap_ShortTermLeaseCost_a9b9c320-f329-4968-9155-37e739c01886" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OtherLeaseCost_183a80dd-6167-4e9e-9c05-f64e8a4f69c4" xlink:href="paa-20221231.xsd#paa_OtherLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_437ad8ec-cd5c-4eb8-a2a6-cc04425b062a" xlink:to="loc_paa_OtherLeaseCost_183a80dd-6167-4e9e-9c05-f64e8a4f69c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_1a285249-25e8-485b-b0a4-fb55793c2cd1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_437ad8ec-cd5c-4eb8-a2a6-cc04425b062a" xlink:to="loc_us-gaap_LeaseCost_1a285249-25e8-485b-b0a4-fb55793c2cd1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_04c6f093-41f1-446a-b47b-3ced664d14ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_437ad8ec-cd5c-4eb8-a2a6-cc04425b062a" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_04c6f093-41f1-446a-b47b-3ced664d14ce" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_539a9f73-9acd-43aa-bdee-34fab74a7716" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_437ad8ec-cd5c-4eb8-a2a6-cc04425b062a" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_539a9f73-9acd-43aa-bdee-34fab74a7716" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6fc28e4b-8183-4c28-bed2-9f6be6582a34" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_539a9f73-9acd-43aa-bdee-34fab74a7716" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6fc28e4b-8183-4c28-bed2-9f6be6582a34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_6fc28e4b-8183-4c28-bed2-9f6be6582a34_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6fc28e4b-8183-4c28-bed2-9f6be6582a34" xlink:to="loc_us-gaap_RelatedPartyDomain_6fc28e4b-8183-4c28-bed2-9f6be6582a34_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_dc993c98-4977-4854-982f-655bbac73ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_6fc28e4b-8183-4c28-bed2-9f6be6582a34" xlink:to="loc_us-gaap_RelatedPartyDomain_dc993c98-4977-4854-982f-655bbac73ceb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_793335dd-95bd-42ae-a97f-a6a5fa1031f6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_dc993c98-4977-4854-982f-655bbac73ceb" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_793335dd-95bd-42ae-a97f-a6a5fa1031f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_bc9ddcb5-9eb0-4dd1-9bbf-aebea7af74f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_539a9f73-9acd-43aa-bdee-34fab74a7716" xlink:to="loc_us-gaap_OtherCommitmentsAxis_bc9ddcb5-9eb0-4dd1-9bbf-aebea7af74f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_bc9ddcb5-9eb0-4dd1-9bbf-aebea7af74f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_bc9ddcb5-9eb0-4dd1-9bbf-aebea7af74f4" xlink:to="loc_us-gaap_OtherCommitmentsDomain_bc9ddcb5-9eb0-4dd1-9bbf-aebea7af74f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_aec0617d-b38c-49ae-bc96-5eac66f073b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_bc9ddcb5-9eb0-4dd1-9bbf-aebea7af74f4" xlink:to="loc_us-gaap_OtherCommitmentsDomain_aec0617d-b38c-49ae-bc96-5eac66f073b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_0d2ce9a1-7cf1-417a-bb8d-11b69fa0c9dc" xlink:href="paa-20221231.xsd#paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_aec0617d-b38c-49ae-bc96-5eac66f073b3" xlink:to="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_0d2ce9a1-7cf1-417a-bb8d-11b69fa0c9dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_756e457a-6af6-486a-a274-f4e301bae727" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_539a9f73-9acd-43aa-bdee-34fab74a7716" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_756e457a-6af6-486a-a274-f4e301bae727" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_756e457a-6af6-486a-a274-f4e301bae727_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_756e457a-6af6-486a-a274-f4e301bae727" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_756e457a-6af6-486a-a274-f4e301bae727_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_9d7fed42-88a9-4037-83ff-8e8bb36ee29e" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_756e457a-6af6-486a-a274-f4e301bae727" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_9d7fed42-88a9-4037-83ff-8e8bb36ee29e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_50cd3667-89f3-4f69-b9e9-2494b82ed0ac" xlink:href="paa-20221231.xsd#paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_9d7fed42-88a9-4037-83ff-8e8bb36ee29e" xlink:to="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_50cd3667-89f3-4f69-b9e9-2494b82ed0ac" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/LeasesOtherInformationDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#LeasesOtherInformationDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/LeasesOtherInformationDetails" xlink:type="extended" id="ia6434a7b01724ebc979363108e4679aa_LeasesOtherInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_b760bf70-17b4-4cce-b106-acd75d4bd71a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:to="loc_us-gaap_OperatingLeasePayments_b760bf70-17b4-4cce-b106-acd75d4bd71a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_a289aa80-3963-409b-ae75-77d1d1e7b10e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseInterestPaymentOnLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:to="loc_us-gaap_FinanceLeaseInterestPaymentOnLiability_a289aa80-3963-409b-ae75-77d1d1e7b10e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_b097e9ae-a3e1-4738-aa43-6fea7cb867dc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeasePrincipalPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_b097e9ae-a3e1-4738-aa43-6fea7cb867dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_e3e916ef-7953-4d3b-a08b-10c955908fb7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_e3e916ef-7953-4d3b-a08b-10c955908fb7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_bec2bbdf-f99d-48db-b8c4-67887d93b774" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_bec2bbdf-f99d-48db-b8c4-67887d93b774" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_52732cd6-4c9c-4c22-897a-964f72fb8914" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_52732cd6-4c9c-4c22-897a-964f72fb8914" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_661315c6-a9db-4310-960f-4eefd23ed9a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:to="loc_us-gaap_FinanceLeaseLiability_661315c6-a9db-4310-960f-4eefd23ed9a3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_682d7f06-5a3d-4277-9147-77e3cbfcd094" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_48ca18de-b390-4ee8-915e-786f7328becd" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_682d7f06-5a3d-4277-9147-77e3cbfcd094" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b081bf2c-d95a-4e0a-9fac-5dabe2a08b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_682d7f06-5a3d-4277-9147-77e3cbfcd094" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b081bf2c-d95a-4e0a-9fac-5dabe2a08b1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_b081bf2c-d95a-4e0a-9fac-5dabe2a08b1b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b081bf2c-d95a-4e0a-9fac-5dabe2a08b1b" xlink:to="loc_us-gaap_RelatedPartyDomain_b081bf2c-d95a-4e0a-9fac-5dabe2a08b1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_d9297eb4-a557-4775-a5ab-80bc4b08d1a2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_b081bf2c-d95a-4e0a-9fac-5dabe2a08b1b" xlink:to="loc_us-gaap_RelatedPartyDomain_d9297eb4-a557-4775-a5ab-80bc4b08d1a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_5ccbfc7e-4a9f-431b-85ed-7d6cc9110ab9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_d9297eb4-a557-4775-a5ab-80bc4b08d1a2" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_5ccbfc7e-4a9f-431b-85ed-7d6cc9110ab9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_597a38b1-bef1-41b5-85b9-9070d098c8d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_682d7f06-5a3d-4277-9147-77e3cbfcd094" xlink:to="loc_us-gaap_OtherCommitmentsAxis_597a38b1-bef1-41b5-85b9-9070d098c8d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_597a38b1-bef1-41b5-85b9-9070d098c8d2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_597a38b1-bef1-41b5-85b9-9070d098c8d2" xlink:to="loc_us-gaap_OtherCommitmentsDomain_597a38b1-bef1-41b5-85b9-9070d098c8d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_361836fc-c0e5-4fe4-bac2-46ff087025d6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_597a38b1-bef1-41b5-85b9-9070d098c8d2" xlink:to="loc_us-gaap_OtherCommitmentsDomain_361836fc-c0e5-4fe4-bac2-46ff087025d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_3117df12-ef0c-4a31-8988-6a9c208ba72a" xlink:href="paa-20221231.xsd#paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_361836fc-c0e5-4fe4-bac2-46ff087025d6" xlink:to="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_3117df12-ef0c-4a31-8988-6a9c208ba72a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_38784834-fc4b-4d04-b445-c41f74c49442" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_682d7f06-5a3d-4277-9147-77e3cbfcd094" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_38784834-fc4b-4d04-b445-c41f74c49442" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_38784834-fc4b-4d04-b445-c41f74c49442_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_38784834-fc4b-4d04-b445-c41f74c49442" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_38784834-fc4b-4d04-b445-c41f74c49442_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_c93f90f3-ce39-44cc-9919-6674e58532b9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_38784834-fc4b-4d04-b445-c41f74c49442" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_c93f90f3-ce39-44cc-9919-6674e58532b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_0d56a92d-7d5e-4fce-a45a-c4705fbc7002" xlink:href="paa-20221231.xsd#paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_c93f90f3-ce39-44cc-9919-6674e58532b9" xlink:to="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_0d56a92d-7d5e-4fce-a45a-c4705fbc7002" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/LeasesAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#LeasesAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/LeasesAssetsandLiabilitiesDetails" xlink:type="extended" id="i52cf8d84d2ba49e8a478fe7fbd2d47b1_LeasesAssetsandLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_232885ce-0fc4-48b8-aa08-6cb7ba5f9ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_232885ce-0fc4-48b8-aa08-6cb7ba5f9ac9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_40aef2d2-d47c-4832-8224-3913b4a2cb2e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetBeforeAccumulatedAmortization_40aef2d2-d47c-4832-8224-3913b4a2cb2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_b297be9e-7249-46c8-9718-18f5a512e1da" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAccumulatedAmortization_b297be9e-7249-46c8-9718-18f5a512e1da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_fc789d5a-5ab8-41c4-ab14-5ba15471ca6e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_fc789d5a-5ab8-41c4-ab14-5ba15471ca6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_5cade4b5-5c75-4d12-bda4-a4cc31b1b4f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseRightOfUseAsset_fc789d5a-5ab8-41c4-ab14-5ba15471ca6e" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_5cade4b5-5c75-4d12-bda4-a4cc31b1b4f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LeasesRightOfUseAsset_db1a462e-d6b8-45ea-91ad-bd48b9a5125e" xlink:href="paa-20221231.xsd#paa_LeasesRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_paa_LeasesRightOfUseAsset_db1a462e-d6b8-45ea-91ad-bd48b9a5125e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_1e557e13-de23-4b41-a322-d77a4e75b42a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseDescriptionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_1e557e13-de23-4b41-a322-d77a4e75b42a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_72a11f70-323a-48ed-bef9-0ac38d88bfc3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_1e557e13-de23-4b41-a322-d77a4e75b42a" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_72a11f70-323a-48ed-bef9-0ac38d88bfc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_2dd4690f-1d67-46f3-a46d-50a73d298a66" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilityCurrent_72a11f70-323a-48ed-bef9-0ac38d88bfc3" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_2dd4690f-1d67-46f3-a46d-50a73d298a66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_164fb7da-188c-46be-bf19-d9ea7fd59793" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_1e557e13-de23-4b41-a322-d77a4e75b42a" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_164fb7da-188c-46be-bf19-d9ea7fd59793" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_a4ad5b65-da90-4201-8283-0ac39edea6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeOperatingLeaseDescriptionAbstract_1e557e13-de23-4b41-a322-d77a4e75b42a" xlink:to="loc_us-gaap_OperatingLeaseLiability_a4ad5b65-da90-4201-8283-0ac39edea6f5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeFinanceLeaseDescriptionAbstract_91499c6c-f5bf-4a2a-b750-45d2d2bf027c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeFinanceLeaseDescriptionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_us-gaap_LesseeFinanceLeaseDescriptionAbstract_91499c6c-f5bf-4a2a-b750-45d2d2bf027c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_b4817b46-9100-4728-b214-cc5ecda48b6d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeFinanceLeaseDescriptionAbstract_91499c6c-f5bf-4a2a-b750-45d2d2bf027c" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_b4817b46-9100-4728-b214-cc5ecda48b6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_982cbcd2-80ea-446a-b581-715a71aa7249" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilityCurrent_b4817b46-9100-4728-b214-cc5ecda48b6d" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_982cbcd2-80ea-446a-b581-715a71aa7249" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_0645506a-2175-4933-8a35-82dd6b7c1455" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeFinanceLeaseDescriptionAbstract_91499c6c-f5bf-4a2a-b750-45d2d2bf027c" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_0645506a-2175-4933-8a35-82dd6b7c1455" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_523683c8-788f-4171-9264-44d4d93e10b4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_0645506a-2175-4933-8a35-82dd6b7c1455" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_523683c8-788f-4171-9264-44d4d93e10b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_2d659ba9-8292-4684-8080-4f7486f4db12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeFinanceLeaseDescriptionAbstract_91499c6c-f5bf-4a2a-b750-45d2d2bf027c" xlink:to="loc_us-gaap_FinanceLeaseLiability_2d659ba9-8292-4684-8080-4f7486f4db12" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LeasesLiability_cf2d1a17-4adf-4dda-ae94-db4ec0e4037b" xlink:href="paa-20221231.xsd#paa_LeasesLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_paa_LeasesLiability_cf2d1a17-4adf-4dda-ae94-db4ec0e4037b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_59afb1c0-4011-486e-a15c-8e704ac85688" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_59afb1c0-4011-486e-a15c-8e704ac85688" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_b4414149-8156-4a45-ad59-b1331dd02f89" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_611ad5fc-8f7b-4b6e-914d-f301b4c20279" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_b4414149-8156-4a45-ad59-b1331dd02f89" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_da8cfa30-7247-47d9-a1f6-327d0771f1f3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_b4414149-8156-4a45-ad59-b1331dd02f89" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_da8cfa30-7247-47d9-a1f6-327d0771f1f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_da8cfa30-7247-47d9-a1f6-327d0771f1f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_da8cfa30-7247-47d9-a1f6-327d0771f1f3" xlink:to="loc_us-gaap_RelatedPartyDomain_da8cfa30-7247-47d9-a1f6-327d0771f1f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_1fae91bb-bd40-42e2-897a-177e4de4cd0c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_da8cfa30-7247-47d9-a1f6-327d0771f1f3" xlink:to="loc_us-gaap_RelatedPartyDomain_1fae91bb-bd40-42e2-897a-177e4de4cd0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_4839a186-e08f-4ee4-95dc-6e5d405edb67" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_1fae91bb-bd40-42e2-897a-177e4de4cd0c" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_4839a186-e08f-4ee4-95dc-6e5d405edb67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_171dd7a4-d9d9-417e-93fb-eb98afb25b43" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_b4414149-8156-4a45-ad59-b1331dd02f89" xlink:to="loc_us-gaap_OtherCommitmentsAxis_171dd7a4-d9d9-417e-93fb-eb98afb25b43" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_171dd7a4-d9d9-417e-93fb-eb98afb25b43_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_171dd7a4-d9d9-417e-93fb-eb98afb25b43" xlink:to="loc_us-gaap_OtherCommitmentsDomain_171dd7a4-d9d9-417e-93fb-eb98afb25b43_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_127d55cd-15ff-46cd-ab5d-8d49df211cf9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_171dd7a4-d9d9-417e-93fb-eb98afb25b43" xlink:to="loc_us-gaap_OtherCommitmentsDomain_127d55cd-15ff-46cd-ab5d-8d49df211cf9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_261aea45-de11-4689-8701-76c1dd375fc2" xlink:href="paa-20221231.xsd#paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_127d55cd-15ff-46cd-ab5d-8d49df211cf9" xlink:to="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_261aea45-de11-4689-8701-76c1dd375fc2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_62724c0a-0cef-4537-b1d7-b81de088a63d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_b4414149-8156-4a45-ad59-b1331dd02f89" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_62724c0a-0cef-4537-b1d7-b81de088a63d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_62724c0a-0cef-4537-b1d7-b81de088a63d_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_62724c0a-0cef-4537-b1d7-b81de088a63d" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_62724c0a-0cef-4537-b1d7-b81de088a63d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_75431389-6fb5-4f89-b445-17fd69365687" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_62724c0a-0cef-4537-b1d7-b81de088a63d" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_75431389-6fb5-4f89-b445-17fd69365687" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_0a935914-55a1-4b49-9dca-c8bb7ab72b0d" xlink:href="paa-20221231.xsd#paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_75431389-6fb5-4f89-b445-17fd69365687" xlink:to="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_0a935914-55a1-4b49-9dca-c8bb7ab72b0d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/LeasesMaturityofLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#LeasesMaturityofLeaseLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/LeasesMaturityofLeaseLiabilitiesDetails" xlink:type="extended" id="i9de5f34f270b4f619f638e922c5d2085_LeasesMaturityofLeaseLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_a47e9b17-ee5e-47b8-b189-938c4f1b4cf1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a47e9b17-ee5e-47b8-b189-938c4f1b4cf1" xlink:to="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_ab8fe1ed-26b1-479b-bf0e-1781678a1543" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_ab8fe1ed-26b1-479b-bf0e-1781678a1543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_d4228ace-5833-4c4c-90b0-5f5764ac4925" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_d4228ace-5833-4c4c-90b0-5f5764ac4925" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_61bba0c3-4e44-4e23-bc59-6f7e0c9cfb6b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_61bba0c3-4e44-4e23-bc59-6f7e0c9cfb6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_7e8a7c97-6489-4400-8eb2-6561e1810c26" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_7e8a7c97-6489-4400-8eb2-6561e1810c26" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_94848024-50e0-4087-b845-2d6d0075032a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_94848024-50e0-4087-b845-2d6d0075032a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_755a3487-8351-4915-b992-4c1c25811027" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_755a3487-8351-4915-b992-4c1c25811027" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_59591b21-f86e-47e0-92ad-6e998abbab49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_59591b21-f86e-47e0-92ad-6e998abbab49" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_12974cab-1510-489f-8e46-b4d0d0ea1e81" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_12974cab-1510-489f-8e46-b4d0d0ea1e81" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_76720457-2818-4959-ad2d-b189af0e6fa4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_dba9d27b-10a9-4f19-92a7-5e84cc1ff3ef" xlink:to="loc_us-gaap_OperatingLeaseLiability_76720457-2818-4959-ad2d-b189af0e6fa4" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a47e9b17-ee5e-47b8-b189-938c4f1b4cf1" xlink:to="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_8e87c498-1929-4028-871c-cf81718af08d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_8e87c498-1929-4028-871c-cf81718af08d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_804e6c52-8fd8-4938-ab16-6704c73f8122" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_804e6c52-8fd8-4938-ab16-6704c73f8122" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9d37ba7b-693e-4373-acbd-6068dbaa9f14" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_9d37ba7b-693e-4373-acbd-6068dbaa9f14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_77b58213-1a6f-442d-a432-7a85c942f193" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_77b58213-1a6f-442d-a432-7a85c942f193" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_9568e8b8-a93b-40e3-a7b7-ca6437aa45e5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_9568e8b8-a93b-40e3-a7b7-ca6437aa45e5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_9d0ad1c9-e892-49f2-b801-2ff52a1b5fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_9d0ad1c9-e892-49f2-b801-2ff52a1b5fa7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b6684095-ef67-442d-808f-9d5a57d85571" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_b6684095-ef67-442d-808f-9d5a57d85571" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_0055c4ef-824f-44c8-9d40-2bc81212decf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_0055c4ef-824f-44c8-9d40-2bc81212decf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_11c57b7b-0360-4f4c-bb65-95e1f5d0821a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_FinanceLeaseLiability_11c57b7b-0360-4f4c-bb65-95e1f5d0821a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_66083b22-eb6c-483e-826c-f12740b6f7b1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_d90d92df-8211-43b8-ad38-6322e461fc49" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_66083b22-eb6c-483e-826c-f12740b6f7b1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_6a77c733-76ce-4d7a-afdd-1612b1eaa466" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LesseeLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_a47e9b17-ee5e-47b8-b189-938c4f1b4cf1" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_6a77c733-76ce-4d7a-afdd-1612b1eaa466" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fb9c6338-99a3-4ced-bc40-5a92145d435e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_6a77c733-76ce-4d7a-afdd-1612b1eaa466" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fb9c6338-99a3-4ced-bc40-5a92145d435e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_fb9c6338-99a3-4ced-bc40-5a92145d435e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fb9c6338-99a3-4ced-bc40-5a92145d435e" xlink:to="loc_us-gaap_RelatedPartyDomain_fb9c6338-99a3-4ced-bc40-5a92145d435e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_75bca448-afdf-4ae4-a7dd-9d2d56c6a1f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_fb9c6338-99a3-4ced-bc40-5a92145d435e" xlink:to="loc_us-gaap_RelatedPartyDomain_75bca448-afdf-4ae4-a7dd-9d2d56c6a1f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_fa128217-943d-4420-b790-d06ee8decf5b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_75bca448-afdf-4ae4-a7dd-9d2d56c6a1f4" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_fa128217-943d-4420-b790-d06ee8decf5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_00012113-c01f-4700-ad0e-2f14e1496d13" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_6a77c733-76ce-4d7a-afdd-1612b1eaa466" xlink:to="loc_us-gaap_OtherCommitmentsAxis_00012113-c01f-4700-ad0e-2f14e1496d13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_00012113-c01f-4700-ad0e-2f14e1496d13_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_00012113-c01f-4700-ad0e-2f14e1496d13" xlink:to="loc_us-gaap_OtherCommitmentsDomain_00012113-c01f-4700-ad0e-2f14e1496d13_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_7291646b-379e-4563-96df-7fd2a9431f26" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_00012113-c01f-4700-ad0e-2f14e1496d13" xlink:to="loc_us-gaap_OtherCommitmentsDomain_7291646b-379e-4563-96df-7fd2a9431f26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_2073b244-331e-4b7f-9f6a-5f67753818a1" xlink:href="paa-20221231.xsd#paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_7291646b-379e-4563-96df-7fd2a9431f26" xlink:to="loc_paa_AgreementsToUtilizeAssetsOfEquityMethodInvesteesMember_2073b244-331e-4b7f-9f6a-5f67753818a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_73ca89d3-2743-4d46-bec3-2110aa28c5a8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_6a77c733-76ce-4d7a-afdd-1612b1eaa466" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_73ca89d3-2743-4d46-bec3-2110aa28c5a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_73ca89d3-2743-4d46-bec3-2110aa28c5a8_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_73ca89d3-2743-4d46-bec3-2110aa28c5a8" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_73ca89d3-2743-4d46-bec3-2110aa28c5a8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_b3ef788e-3348-413c-9ce0-7663f495dfb9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_73ca89d3-2743-4d46-bec3-2110aa28c5a8" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_b3ef788e-3348-413c-9ce0-7663f495dfb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_72ebcf11-396c-4423-8f99-34aa4b282e76" xlink:href="paa-20221231.xsd#paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_b3ef788e-3348-413c-9ce0-7663f495dfb9" xlink:to="loc_paa_EquityMethodInvesteeThatOwnsLeasedStorageTanksMember_72ebcf11-396c-4423-8f99-34aa4b282e76" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/LeasesLessorOperatingLeaseRevenueDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#LeasesLessorOperatingLeaseRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/LeasesLessorOperatingLeaseRevenueDetails" xlink:type="extended" id="id2670b14a4b14839aadcbf65d5820463_LeasesLessorOperatingLeaseRevenueDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionLineItems_b202ed2b-bc2f-403d-98a4-1b94b851bfc9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_13cdf383-0448-425e-b712-3304ad530cfa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_b202ed2b-bc2f-403d-98a4-1b94b851bfc9" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_13cdf383-0448-425e-b712-3304ad530cfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseIncomeComprehensiveIncomeExtensibleList_5dbcf088-a0ee-47e0-ab04-65f452b19e63" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingLeaseIncomeComprehensiveIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLeaseIncome_13cdf383-0448-425e-b712-3304ad530cfa" xlink:to="loc_us-gaap_OperatingLeaseIncomeComprehensiveIncomeExtensibleList_5dbcf088-a0ee-47e0-ab04-65f452b19e63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionTable_15aaf0a6-f9b8-44b0-a1d8-7d19e520d273" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LessorLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_b202ed2b-bc2f-403d-98a4-1b94b851bfc9" xlink:to="loc_us-gaap_LessorLeaseDescriptionTable_15aaf0a6-f9b8-44b0-a1d8-7d19e520d273" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_d0237892-ac41-4f0e-8e92-c99937d585d8" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LessorLeaseDescriptionTable_15aaf0a6-f9b8-44b0-a1d8-7d19e520d273" xlink:to="loc_srt_ProductOrServiceAxis_d0237892-ac41-4f0e-8e92-c99937d585d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_d0237892-ac41-4f0e-8e92-c99937d585d8_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_d0237892-ac41-4f0e-8e92-c99937d585d8" xlink:to="loc_srt_ProductsAndServicesDomain_d0237892-ac41-4f0e-8e92-c99937d585d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_763978ec-cebf-4421-8287-f115cf9ee119" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_d0237892-ac41-4f0e-8e92-c99937d585d8" xlink:to="loc_srt_ProductsAndServicesDomain_763978ec-cebf-4421-8287-f115cf9ee119" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_8ad6a2a6-d65e-429d-9a7d-be2c975a4254" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_763978ec-cebf-4421-8287-f115cf9ee119" xlink:to="loc_us-gaap_ServiceMember_8ad6a2a6-d65e-429d-9a7d-be2c975a4254" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/IncomeTaxesReconciliationandDeferredTaxAssetsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#IncomeTaxesReconciliationandDeferredTaxAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/IncomeTaxesReconciliationandDeferredTaxAssetsDetails" xlink:type="extended" id="icdfe101f875a4fdc83e2ebc6a970c119_IncomeTaxesReconciliationandDeferredTaxAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_d2bd5a68-1caf-448a-b6b0-37cc4350c0f5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_d2bd5a68-1caf-448a-b6b0-37cc4350c0f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IncomeNotSubjectToForeignTax_dd8b3487-d345-4e8a-b6d8-7a04e32c9f43" xlink:href="paa-20221231.xsd#paa_IncomeNotSubjectToForeignTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_paa_IncomeNotSubjectToForeignTax_dd8b3487-d345-4e8a-b6d8-7a04e32c9f43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IncomeSubjectToForeignTax_27e2ec4a-acc2-4642-943d-66f3c01dac35" xlink:href="paa-20221231.xsd#paa_IncomeSubjectToForeignTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_paa_IncomeSubjectToForeignTax_27e2ec4a-acc2-4642-943d-66f3c01dac35" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ForeignTaxRate_5244de66-fb5f-4c0e-bd13-7128ee5a16b6" xlink:href="paa-20221231.xsd#paa_ForeignTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_paa_ForeignTaxRate_5244de66-fb5f-4c0e-bd13-7128ee5a16b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate_cc500466-3f8f-4f30-b955-ba76bed65856" xlink:href="paa-20221231.xsd#paa_ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_paa_ForeignIncomeTaxExpenseBenefitAtForeignStatutoryRate_cc500466-3f8f-4f30-b955-ba76bed65856" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ForeignPeriodTaxOnPermanentBookVersusTaxDifferencesAndRateChanges_49a34746-f578-4d5b-8a50-35b1352b79cb" xlink:href="paa-20221231.xsd#paa_ForeignPeriodTaxOnPermanentBookVersusTaxDifferencesAndRateChanges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_paa_ForeignPeriodTaxOnPermanentBookVersusTaxDifferencesAndRateChanges_49a34746-f578-4d5b-8a50-35b1352b79cb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_8da807d4-9760-4550-af9f-480431d6b661" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CurrentStateAndLocalTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_CurrentStateAndLocalTaxExpenseBenefit_8da807d4-9760-4550-af9f-480431d6b661" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_8b9318da-148b-46e6-9b0e-651cb9d5c932" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_8b9318da-148b-46e6-9b0e-651cb9d5c932" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_3fd0cafe-5df9-4641-aa42-064841142049" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComponentsOfDeferredTaxAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_3fd0cafe-5df9-4641-aa42-064841142049" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsDerivativeInstruments_77350b87-56b1-4716-b95d-ec54df529f35" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxAssetsDerivativeInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_3fd0cafe-5df9-4641-aa42-064841142049" xlink:to="loc_us-gaap_DeferredTaxAssetsDerivativeInstruments_77350b87-56b1-4716-b95d-ec54df529f35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DeferredTaxAssetsLeasingArrangements_c57170a8-4675-440b-9195-0f00ce91c581" xlink:href="paa-20221231.xsd#paa_DeferredTaxAssetsLeasingArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_3fd0cafe-5df9-4641-aa42-064841142049" xlink:to="loc_paa_DeferredTaxAssetsLeasingArrangements_c57170a8-4675-440b-9195-0f00ce91c581" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_df164877-f933-4896-bac9-1b082f901428" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxAssetsOperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_3fd0cafe-5df9-4641-aa42-064841142049" xlink:to="loc_us-gaap_DeferredTaxAssetsOperatingLossCarryforwards_df164877-f933-4896-bac9-1b082f901428" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_15445e98-ca34-4876-88df-70e80d4d88b7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_3fd0cafe-5df9-4641-aa42-064841142049" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_15445e98-ca34-4876-88df-70e80d4d88b7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_234dd87f-b4f4-46fe-9c0a-34735a5e3ab8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_3fd0cafe-5df9-4641-aa42-064841142049" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_234dd87f-b4f4-46fe-9c0a-34735a5e3ab8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_6ab20373-6841-43f2-989e-c3c361b9924f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_6ab20373-6841-43f2-989e-c3c361b9924f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_d2031a1e-a941-42dc-bd2c-47020422a1f7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_6ab20373-6841-43f2-989e-c3c361b9924f" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_d2031a1e-a941-42dc-bd2c-47020422a1f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesDerivatives_697c5544-0884-439b-bff0-b18e06c27ac7" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxLiabilitiesDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_6ab20373-6841-43f2-989e-c3c361b9924f" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesDerivatives_697c5544-0884-439b-bff0-b18e06c27ac7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_4f9e1922-f6a1-41c4-b117-cd44509652c0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxLiabilitiesLeasingArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_6ab20373-6841-43f2-989e-c3c361b9924f" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesLeasingArrangements_4f9e1922-f6a1-41c4-b117-cd44509652c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_5064a806-5e99-469a-9627-6822d52ba036" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_6ab20373-6841-43f2-989e-c3c361b9924f" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_5064a806-5e99-469a-9627-6822d52ba036" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilities_552cf58d-1bea-48ea-b95e-7a80c02d62e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_6ab20373-6841-43f2-989e-c3c361b9924f" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilities_552cf58d-1bea-48ea-b95e-7a80c02d62e6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_5e9c84e4-0eac-4736-bf58-f7ef84573ee2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_DeferredTaxLiabilities_5e9c84e4-0eac-4736-bf58-f7ef84573ee2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_9d724399-b736-4291-b4e9-8967ef640270" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_9d724399-b736-4291-b4e9-8967ef640270" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_81147de4-59ee-43a0-917d-278e0b5ac6fe" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_81147de4-59ee-43a0-917d-278e0b5ac6fe" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_9f6cccbe-2b39-43ad-990c-1bae1ee6d63b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExaminationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_232f5a34-80d4-41e7-9010-4b3e71045893" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_9f6cccbe-2b39-43ad-990c-1bae1ee6d63b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_ee3060d5-a7a9-43c2-94cf-162f2381194d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_9f6cccbe-2b39-43ad-990c-1bae1ee6d63b" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_ee3060d5-a7a9-43c2-94cf-162f2381194d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_ee3060d5-a7a9-43c2-94cf-162f2381194d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_ee3060d5-a7a9-43c2-94cf-162f2381194d" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_ee3060d5-a7a9-43c2-94cf-162f2381194d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_0890f02a-4056-4b6a-9051-1e17829d5f7c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_ee3060d5-a7a9-43c2-94cf-162f2381194d" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_0890f02a-4056-4b6a-9051-1e17829d5f7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_84b8a013-8f8f-45f8-bf77-bc77040616a9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0890f02a-4056-4b6a-9051-1e17829d5f7c" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_84b8a013-8f8f-45f8-bf77-bc77040616a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesMember_51bca81f-a744-48e6-9046-1977dc1a229f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_0890f02a-4056-4b6a-9051-1e17829d5f7c" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesMember_51bca81f-a744-48e6-9046-1977dc1a229f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#IncomeTaxesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" id="i60d71bebc6864e349798b3080fc859f4_IncomeTaxesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationLineItems_9423f04c-2060-421d-96fb-743b8caddb72" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExaminationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IncomeTaxExaminationAmountofAssessmentDisputed_2976e015-7716-44b3-b8af-e2d8b9e56b9a" xlink:href="paa-20221231.xsd#paa_IncomeTaxExaminationAmountofAssessmentDisputed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_9423f04c-2060-421d-96fb-743b8caddb72" xlink:to="loc_paa_IncomeTaxExaminationAmountofAssessmentDisputed_2976e015-7716-44b3-b8af-e2d8b9e56b9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IncomeTaxExaminationAmountofDisputedAssessmentPaid_02c791b9-cfd9-418f-8528-b1bdc41c484e" xlink:href="paa-20221231.xsd#paa_IncomeTaxExaminationAmountofDisputedAssessmentPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_9423f04c-2060-421d-96fb-743b8caddb72" xlink:to="loc_paa_IncomeTaxExaminationAmountofDisputedAssessmentPaid_02c791b9-cfd9-418f-8528-b1bdc41c484e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExaminationTable_e621056a-405c-41fc-8bd7-e820798a4ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExaminationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxExaminationLineItems_9423f04c-2060-421d-96fb-743b8caddb72" xlink:to="loc_us-gaap_IncomeTaxExaminationTable_e621056a-405c-41fc-8bd7-e820798a4ef0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameAxis_2cf28e4b-a622-421d-98aa-92907ca20eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_e621056a-405c-41fc-8bd7-e820798a4ef0" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameAxis_2cf28e4b-a622-421d-98aa-92907ca20eb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_2cf28e4b-a622-421d-98aa-92907ca20eb8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_2cf28e4b-a622-421d-98aa-92907ca20eb8" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_2cf28e4b-a622-421d-98aa-92907ca20eb8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_1cb5372c-06f6-43b9-9ff6-041e869d9fe6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_2cf28e4b-a622-421d-98aa-92907ca20eb8" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_1cb5372c-06f6-43b9-9ff6-041e869d9fe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CanadianTaxAuthoritiesMember_a395caeb-f3ca-4d6a-ac1f-d4e999747656" xlink:href="paa-20221231.xsd#paa_CanadianTaxAuthoritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_1cb5372c-06f6-43b9-9ff6-041e869d9fe6" xlink:to="loc_paa_CanadianTaxAuthoritiesMember_a395caeb-f3ca-4d6a-ac1f-d4e999747656" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_adfeb2e7-e816-4336-8283-48284388841e" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_e621056a-405c-41fc-8bd7-e820798a4ef0" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_adfeb2e7-e816-4336-8283-48284388841e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_adfeb2e7-e816-4336-8283-48284388841e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_adfeb2e7-e816-4336-8283-48284388841e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_adfeb2e7-e816-4336-8283-48284388841e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_de0148b7-c740-4f46-8a3f-f414ca7b4db9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_adfeb2e7-e816-4336-8283-48284388841e" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_de0148b7-c740-4f46-8a3f-f414ca7b4db9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_0a9e90f3-47b9-4296-b5f5-507cd3dc2152" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ForeignCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_de0148b7-c740-4f46-8a3f-f414ca7b4db9" xlink:to="loc_us-gaap_ForeignCountryMember_0a9e90f3-47b9-4296-b5f5-507cd3dc2152" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_41669473-d52d-401c-8285-b6651570e392" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxExaminationTable_e621056a-405c-41fc-8bd7-e820798a4ef0" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_41669473-d52d-401c-8285-b6651570e392" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_41669473-d52d-401c-8285-b6651570e392_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_41669473-d52d-401c-8285-b6651570e392" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_41669473-d52d-401c-8285-b6651570e392_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_7c9b3a45-ebcb-4e7c-9c6e-fa35b30eea7a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_41669473-d52d-401c-8285-b6651570e392" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_7c9b3a45-ebcb-4e7c-9c6e-fa35b30eea7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_18b2673d-15b5-4028-b5d3-3729cf239008" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_7c9b3a45-ebcb-4e7c-9c6e-fa35b30eea7a" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_18b2673d-15b5-4028-b5d3-3729cf239008" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/MajorCustomersandConcentrationofCreditRiskDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#MajorCustomersandConcentrationofCreditRiskDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/MajorCustomersandConcentrationofCreditRiskDetails" xlink:type="extended" id="ibb9c0e153f4343aba102f707af40c8f7_MajorCustomersandConcentrationofCreditRiskDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_63648cad-80d5-454e-bbb9-c7a0a08ea612" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_94399160-fe3f-43d2-9c10-597f9300621c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_63648cad-80d5-454e-bbb9-c7a0a08ea612" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_94399160-fe3f-43d2-9c10-597f9300621c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_00af8517-2cb7-4b0f-a910-6d0654ead523" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_63648cad-80d5-454e-bbb9-c7a0a08ea612" xlink:to="loc_us-gaap_ConcentrationRiskTable_00af8517-2cb7-4b0f-a910-6d0654ead523" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9cd35d58-c1a0-4d83-9fd2-e740051d5589" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_00af8517-2cb7-4b0f-a910-6d0654ead523" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9cd35d58-c1a0-4d83-9fd2-e740051d5589" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9cd35d58-c1a0-4d83-9fd2-e740051d5589_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9cd35d58-c1a0-4d83-9fd2-e740051d5589" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_9cd35d58-c1a0-4d83-9fd2-e740051d5589_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2e877201-7a15-47f6-bf0f-b4ed93b49163" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_9cd35d58-c1a0-4d83-9fd2-e740051d5589" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2e877201-7a15-47f6-bf0f-b4ed93b49163" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_74585382-5c6a-47ea-a4c2-3aa74579f255" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2e877201-7a15-47f6-bf0f-b4ed93b49163" xlink:to="loc_us-gaap_SalesRevenueNetMember_74585382-5c6a-47ea-a4c2-3aa74579f255" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_10f3cc76-abb4-4756-832b-bffcbb98d433" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_00af8517-2cb7-4b0f-a910-6d0654ead523" xlink:to="loc_srt_MajorCustomersAxis_10f3cc76-abb4-4756-832b-bffcbb98d433" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_10f3cc76-abb4-4756-832b-bffcbb98d433_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_10f3cc76-abb4-4756-832b-bffcbb98d433" xlink:to="loc_srt_NameOfMajorCustomerDomain_10f3cc76-abb4-4756-832b-bffcbb98d433_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_a1b0e04b-a2aa-4bdd-b6fe-8ede63e1ccb2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_10f3cc76-abb4-4756-832b-bffcbb98d433" xlink:to="loc_srt_NameOfMajorCustomerDomain_a1b0e04b-a2aa-4bdd-b6fe-8ede63e1ccb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ExxonMobilCorporationMember_788f0275-574a-43d3-9376-470a62fe009c" xlink:href="paa-20221231.xsd#paa_ExxonMobilCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_a1b0e04b-a2aa-4bdd-b6fe-8ede63e1ccb2" xlink:to="loc_paa_ExxonMobilCorporationMember_788f0275-574a-43d3-9376-470a62fe009c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_MarathonPetroleumCorporationMember_fe68faa8-a297-4152-9f7f-be3c7e235f84" xlink:href="paa-20221231.xsd#paa_MarathonPetroleumCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_a1b0e04b-a2aa-4bdd-b6fe-8ede63e1ccb2" xlink:to="loc_paa_MarathonPetroleumCorporationMember_fe68faa8-a297-4152-9f7f-be3c7e235f84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_BPPlcAndSubsidiariesMember_f7c755ee-7c84-4f6f-88fd-94d5e150161b" xlink:href="paa-20221231.xsd#paa_BPPlcAndSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_a1b0e04b-a2aa-4bdd-b6fe-8ede63e1ccb2" xlink:to="loc_paa_BPPlcAndSubsidiariesMember_f7c755ee-7c84-4f6f-88fd-94d5e150161b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_b9bc4e61-1c85-41e6-a073-a0d58ca4d673" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_00af8517-2cb7-4b0f-a910-6d0654ead523" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_b9bc4e61-1c85-41e6-a073-a0d58ca4d673" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_b9bc4e61-1c85-41e6-a073-a0d58ca4d673_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b9bc4e61-1c85-41e6-a073-a0d58ca4d673" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_b9bc4e61-1c85-41e6-a073-a0d58ca4d673_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_24d078ce-54b3-4e9d-9e95-3c593f53709c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_b9bc4e61-1c85-41e6-a073-a0d58ca4d673" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_24d078ce-54b3-4e9d-9e95-3c593f53709c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_3ccce612-1932-42e0-a091-3b7c55b7fc80" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_24d078ce-54b3-4e9d-9e95-3c593f53709c" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_3ccce612-1932-42e0-a091-3b7c55b7fc80" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/RelatedPartyTransactionsDetails" xlink:type="extended" id="i149a28d8c46040519ff5dc71e049e5d0_RelatedPartyTransactionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits_b075cceb-a1aa-47d9-a798-40bbbcf6c0a5" xlink:href="paa-20221231.xsd#paa_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:to="loc_paa_LimitedLiabilityCompanyLLCorLimitedPartnershipLPMembersorLimitedPartnersOwnershipInterestUnits_b075cceb-a1aa-47d9-a798-40bbbcf6c0a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForAdministrativeFees_15592630-021e-4e18-838f-2895f6ac2a77" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentForAdministrativeFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:to="loc_us-gaap_PaymentForAdministrativeFees_15592630-021e-4e18-838f-2895f6ac2a77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_b09ddbf8-30de-45d1-8137-3662bb61f1c1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_b09ddbf8-30de-45d1-8137-3662bb61f1c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromRelatedParties_7f5ed324-bf7a-4ee5-a289-8404c9085ec4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenueFromRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:to="loc_us-gaap_RevenueFromRelatedParties_7f5ed324-bf7a-4ee5-a289-8404c9085ec4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_8be72514-fabd-444c-9b3b-197e99d98365" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:to="loc_us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_8be72514-fabd-444c-9b3b-197e99d98365" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueFromRelatedPartiesCurrent_9e5a5b6d-2bc2-46fd-a403-786c42eece9f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DueFromRelatedPartiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:to="loc_us-gaap_DueFromRelatedPartiesCurrent_9e5a5b6d-2bc2-46fd-a403-786c42eece9f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DueToRelatedPartiesCurrent_20ccdc24-a32a-4fc3-953f-a2971eb49abc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DueToRelatedPartiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:to="loc_us-gaap_DueToRelatedPartiesCurrent_20ccdc24-a32a-4fc3-953f-a2971eb49abc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04582b55-de2a-4bf9-8be6-aee26ecc7e79" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_bca6c6e6-067e-434a-88a6-84ec5eefad10" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04582b55-de2a-4bf9-8be6-aee26ecc7e79" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_30bf65e2-7e65-4fcd-83bc-2eae3ba84dde" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04582b55-de2a-4bf9-8be6-aee26ecc7e79" xlink:to="loc_srt_OwnershipAxis_30bf65e2-7e65-4fcd-83bc-2eae3ba84dde" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_30bf65e2-7e65-4fcd-83bc-2eae3ba84dde_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_30bf65e2-7e65-4fcd-83bc-2eae3ba84dde" xlink:to="loc_srt_OwnershipDomain_30bf65e2-7e65-4fcd-83bc-2eae3ba84dde_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_63b9a113-df33-47ea-84e4-c558d1583746" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_30bf65e2-7e65-4fcd-83bc-2eae3ba84dde" xlink:to="loc_srt_OwnershipDomain_63b9a113-df33-47ea-84e4-c558d1583746" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsGPHoldingsLPMember_1de77643-08de-4a51-bf3e-d91e70a5e625" xlink:href="paa-20221231.xsd#paa_PlainsGPHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_63b9a113-df33-47ea-84e4-c558d1583746" xlink:to="loc_paa_PlainsGPHoldingsLPMember_1de77643-08de-4a51-bf3e-d91e70a5e625" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAAPLPMember_b6c9dac2-6256-4e81-ac0e-f2f31b4bd28c" xlink:href="paa-20221231.xsd#paa_PlainsAAPLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_63b9a113-df33-47ea-84e4-c558d1583746" xlink:to="loc_paa_PlainsAAPLPMember_b6c9dac2-6256-4e81-ac0e-f2f31b4bd28c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_61a6d35b-e97c-4a72-a33f-0bca868882de" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04582b55-de2a-4bf9-8be6-aee26ecc7e79" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_61a6d35b-e97c-4a72-a33f-0bca868882de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_61a6d35b-e97c-4a72-a33f-0bca868882de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_61a6d35b-e97c-4a72-a33f-0bca868882de" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_61a6d35b-e97c-4a72-a33f-0bca868882de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_456744ee-cd53-49b8-b1d9-00b6ce6830f9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_61a6d35b-e97c-4a72-a33f-0bca868882de" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_456744ee-cd53-49b8-b1d9-00b6ce6830f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SharesClassCMember_063923f6-4e22-4355-89c9-252215569fea" xlink:href="paa-20221231.xsd#paa_SharesClassCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_456744ee-cd53-49b8-b1d9-00b6ce6830f9" xlink:to="loc_paa_SharesClassCMember_063923f6-4e22-4355-89c9-252215569fea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5d72837e-0ec8-4fae-abd0-c77866ca48f4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04582b55-de2a-4bf9-8be6-aee26ecc7e79" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5d72837e-0ec8-4fae-abd0-c77866ca48f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_5d72837e-0ec8-4fae-abd0-c77866ca48f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5d72837e-0ec8-4fae-abd0-c77866ca48f4" xlink:to="loc_us-gaap_RelatedPartyDomain_5d72837e-0ec8-4fae-abd0-c77866ca48f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_9f0b7879-a884-4acc-9483-c9b379090b30" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_5d72837e-0ec8-4fae-abd0-c77866ca48f4" xlink:to="loc_us-gaap_RelatedPartyDomain_9f0b7879-a884-4acc-9483-c9b379090b30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsGPHoldingsLPMember_d3708737-46e3-4639-b531-c6e08f3f090f" xlink:href="paa-20221231.xsd#paa_PlainsGPHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_9f0b7879-a884-4acc-9483-c9b379090b30" xlink:to="loc_paa_PlainsGPHoldingsLPMember_d3708737-46e3-4639-b531-c6e08f3f090f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralPartnerMember_1fbddc17-7861-4514-911a-298e342bd3e2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GeneralPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_9f0b7879-a884-4acc-9483-c9b379090b30" xlink:to="loc_us-gaap_GeneralPartnerMember_1fbddc17-7861-4514-911a-298e342bd3e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrincipalOwnerMember_a61a4622-dc6c-4897-8586-b862a26be476" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PrincipalOwnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_9f0b7879-a884-4acc-9483-c9b379090b30" xlink:to="loc_us-gaap_PrincipalOwnerMember_a61a4622-dc6c-4897-8586-b862a26be476" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_a6326326-f745-4b78-bc39-1ad3e28720b2" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_04582b55-de2a-4bf9-8be6-aee26ecc7e79" xlink:to="loc_srt_RangeAxis_a6326326-f745-4b78-bc39-1ad3e28720b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a6326326-f745-4b78-bc39-1ad3e28720b2_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_a6326326-f745-4b78-bc39-1ad3e28720b2" xlink:to="loc_srt_RangeMember_a6326326-f745-4b78-bc39-1ad3e28720b2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_cee6014d-0e8a-4239-9269-a1d68d6f136b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_a6326326-f745-4b78-bc39-1ad3e28720b2" xlink:to="loc_srt_RangeMember_cee6014d-0e8a-4239-9269-a1d68d6f136b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a95efc3a-d3a0-4651-9a7f-3a2b5a01f31d" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_cee6014d-0e8a-4239-9269-a1d68d6f136b" xlink:to="loc_srt_MinimumMember_a95efc3a-d3a0-4651-9a7f-3a2b5a01f31d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/EquityIndexedCompensationPlansPlanInformationDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#EquityIndexedCompensationPlansPlanInformationDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/EquityIndexedCompensationPlansPlanInformationDetails" xlink:type="extended" id="i531c7e8ed6fa4812b916f6b3c2b18fb6_EquityIndexedCompensationPlansPlanInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7f045a0-d2cf-4fe9-892a-e754619cca45" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_98228325-3524-4c3a-8a4f-85b50138c784" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7f045a0-d2cf-4fe9-892a-e754619cca45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_98228325-3524-4c3a-8a4f-85b50138c784" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_7618eb21-1853-4136-89fa-d595b52d1ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7f045a0-d2cf-4fe9-892a-e754619cca45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_7618eb21-1853-4136-89fa-d595b52d1ca6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_c041f5b7-5801-41d1-b457-7d26fd92d4f0" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7f045a0-d2cf-4fe9-892a-e754619cca45" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_c041f5b7-5801-41d1-b457-7d26fd92d4f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding_177cc22b-1ffb-450b-b132-9ee2488d128b" xlink:href="paa-20221231.xsd#paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7f045a0-d2cf-4fe9-892a-e754619cca45" xlink:to="loc_paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIncludingDistributionEquivalentRightsOutstanding_177cc22b-1ffb-450b-b132-9ee2488d128b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsProbableVestingUnrecognizedFairValue_3748d8d8-5792-4c6b-aa65-4d0f280217fb" xlink:href="paa-20221231.xsd#paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsProbableVestingUnrecognizedFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7f045a0-d2cf-4fe9-892a-e754619cca45" xlink:to="loc_paa_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsProbableVestingUnrecognizedFairValue_3748d8d8-5792-4c6b-aa65-4d0f280217fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e56afdd-6f74-4605-be87-6282002821fc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7f045a0-d2cf-4fe9-892a-e754619cca45" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e56afdd-6f74-4605-be87-6282002821fc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_ca46e0f3-a276-43da-8290-33006e6faba5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0e56afdd-6f74-4605-be87-6282002821fc" xlink:to="loc_us-gaap_PlanNameAxis_ca46e0f3-a276-43da-8290-33006e6faba5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_ca46e0f3-a276-43da-8290-33006e6faba5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_ca46e0f3-a276-43da-8290-33006e6faba5" xlink:to="loc_us-gaap_PlanNameDomain_ca46e0f3-a276-43da-8290-33006e6faba5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_0e0e7afa-f167-436b-a2ed-c81eacb2f997" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_ca46e0f3-a276-43da-8290-33006e6faba5" xlink:to="loc_us-gaap_PlanNameDomain_0e0e7afa-f167-436b-a2ed-c81eacb2f997" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAllAmerican2017LongTermIncentivePlanMember_26eb5082-84c6-4f3c-8d4d-c9e0fa7a7c4a" xlink:href="paa-20221231.xsd#paa_PlainsAllAmerican2017LongTermIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_0e0e7afa-f167-436b-a2ed-c81eacb2f997" xlink:to="loc_paa_PlainsAllAmerican2017LongTermIncentivePlanMember_26eb5082-84c6-4f3c-8d4d-c9e0fa7a7c4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember_8e044410-a230-4340-8af8-c21811528eb9" xlink:href="paa-20221231.xsd#paa_PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_0e0e7afa-f167-436b-a2ed-c81eacb2f997" xlink:to="loc_paa_PlainsAllAmericanPNGSuccessorLongTermIncentivePlanMember_8e044410-a230-4340-8af8-c21811528eb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember_26c4c10f-d0c6-43ee-828a-509ebdf1f226" xlink:href="paa-20221231.xsd#paa_PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_0e0e7afa-f167-436b-a2ed-c81eacb2f997" xlink:to="loc_paa_PlainsAllAmericanGPLLCLongTermIncentiveTrackingUnitPlanMember_26c4c10f-d0c6-43ee-828a-509ebdf1f226" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CommitmentsandContingenciesCommitmentsDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#CommitmentsandContingenciesCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/CommitmentsandContingenciesCommitmentsDetails" xlink:type="extended" id="i85fb2b5ffeeb4fb2b91c9dfc47896089_CommitmentsandContingenciesCommitmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_e97b3b99-21ca-4d1e-ac65-3b063e4cb2d2" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LeasesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_e97b3b99-21ca-4d1e-ac65-3b063e4cb2d2" xlink:to="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearOne_e5c9e979-88fc-4e95-82c4-f2a0547d3da7" xlink:href="paa-20221231.xsd#paa_OperatingAndFinanceLeasesLiabilityToBePaidYearOne"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:to="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearOne_e5c9e979-88fc-4e95-82c4-f2a0547d3da7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearTwo_ed21f263-a347-4285-9278-960f49e2859b" xlink:href="paa-20221231.xsd#paa_OperatingAndFinanceLeasesLiabilityToBePaidYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:to="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearTwo_ed21f263-a347-4285-9278-960f49e2859b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearThree_be9d14a6-7540-4226-b5ad-3bdcde179434" xlink:href="paa-20221231.xsd#paa_OperatingAndFinanceLeasesLiabilityToBePaidYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:to="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearThree_be9d14a6-7540-4226-b5ad-3bdcde179434" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearFour_4e30e570-e5a1-4152-abe5-58707a1afb98" xlink:href="paa-20221231.xsd#paa_OperatingAndFinanceLeasesLiabilityToBePaidYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:to="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearFour_4e30e570-e5a1-4152-abe5-58707a1afb98" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearFive_e0a63190-8367-4914-ab6a-1939c3cb0b31" xlink:href="paa-20221231.xsd#paa_OperatingAndFinanceLeasesLiabilityToBePaidYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:to="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidYearFive_e0a63190-8367-4914-ab6a-1939c3cb0b31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidAfterYearFive_348a4a29-0d03-4145-9d28-baba26fe2a7f" xlink:href="paa-20221231.xsd#paa_OperatingAndFinanceLeasesLiabilityToBePaidAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:to="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaidAfterYearFive_348a4a29-0d03-4145-9d28-baba26fe2a7f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaid_217c6d62-b8c6-4f79-8f18-2008b02fe085" xlink:href="paa-20221231.xsd#paa_OperatingAndFinanceLeasesLiabilityToBePaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LeasesAbstract_8cdf7da5-3385-4f2c-967f-f401a8e5e07a" xlink:to="loc_paa_OperatingAndFinanceLeasesLiabilityToBePaid_217c6d62-b8c6-4f79-8f18-2008b02fe085" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentFiscalYearMaturityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_e97b3b99-21ca-4d1e-ac65-3b063e4cb2d2" xlink:to="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_82e486e8-2ecd-4c96-8751-2d59bad53bd4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:to="loc_us-gaap_OtherCommitmentDueInNextTwelveMonths_82e486e8-2ecd-4c96-8751-2d59bad53bd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInSecondYear_d0268a7a-109c-4eed-afbe-6b150a58b8a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentDueInSecondYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:to="loc_us-gaap_OtherCommitmentDueInSecondYear_d0268a7a-109c-4eed-afbe-6b150a58b8a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInThirdYear_b6dad4a4-a4a7-4e11-8c86-ec918d3554a5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentDueInThirdYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:to="loc_us-gaap_OtherCommitmentDueInThirdYear_b6dad4a4-a4a7-4e11-8c86-ec918d3554a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInFourthYear_77433b03-0569-4a3a-b1c4-b63b19478a27" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentDueInFourthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:to="loc_us-gaap_OtherCommitmentDueInFourthYear_77433b03-0569-4a3a-b1c4-b63b19478a27" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueInFifthYear_7ea85e2b-a424-4785-826b-90863b60d173" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentDueInFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:to="loc_us-gaap_OtherCommitmentDueInFifthYear_7ea85e2b-a424-4785-826b-90863b60d173" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentDueAfterFifthYear_a7b18de1-8762-4edc-b795-56566dd331ae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentDueAfterFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:to="loc_us-gaap_OtherCommitmentDueAfterFifthYear_a7b18de1-8762-4edc-b795-56566dd331ae" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_4254a75d-3401-4d50-a4dc-51b7db00efc1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentFiscalYearMaturityAbstract_16f1f79d-7853-4aa3-8bed-fbd9227455ae" xlink:to="loc_us-gaap_OtherCommitment_4254a75d-3401-4d50-a4dc-51b7db00efc1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_e97b3b99-21ca-4d1e-ac65-3b063e4cb2d2" xlink:to="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInNextTwelveMonths_df5174ff-2d14-41fa-940a-7ff7a32fd810" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligationDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:to="loc_us-gaap_ContractualObligationDueInNextTwelveMonths_df5174ff-2d14-41fa-940a-7ff7a32fd810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInSecondYear_41f4e9bc-09e3-42f2-96a8-6d7d273547cd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligationDueInSecondYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:to="loc_us-gaap_ContractualObligationDueInSecondYear_41f4e9bc-09e3-42f2-96a8-6d7d273547cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInThirdYear_691b5d6e-ccb2-45db-97b4-a674e021a1dd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligationDueInThirdYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:to="loc_us-gaap_ContractualObligationDueInThirdYear_691b5d6e-ccb2-45db-97b4-a674e021a1dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInFourthYear_943c708e-df18-4a27-b984-e1d2e2acd4b8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligationDueInFourthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:to="loc_us-gaap_ContractualObligationDueInFourthYear_943c708e-df18-4a27-b984-e1d2e2acd4b8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueInFifthYear_fe4c3d4f-bb6e-45b7-8f6e-0c319a602eb8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligationDueInFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:to="loc_us-gaap_ContractualObligationDueInFifthYear_fe4c3d4f-bb6e-45b7-8f6e-0c319a602eb8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligationDueAfterFifthYear_c103b648-c120-4903-bb53-d2e3d3981e69" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligationDueAfterFifthYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:to="loc_us-gaap_ContractualObligationDueAfterFifthYear_c103b648-c120-4903-bb53-d2e3d3981e69" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualObligation_4140f0ab-995d-4453-8b33-35b030bdbfaa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ContractualObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractualObligationFiscalYearMaturityScheduleAbstract_e55998c6-b79c-4cfe-8874-457839ef7fae" xlink:to="loc_us-gaap_ContractualObligation_4140f0ab-995d-4453-8b33-35b030bdbfaa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases_a075a191-7306-462b-ad57-ef2cc0ee1e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_e97b3b99-21ca-4d1e-ac65-3b063e4cb2d2" xlink:to="loc_us-gaap_UnrecordedUnconditionalPurchaseObligationPurchases_a075a191-7306-462b-ad57-ef2cc0ee1e6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_a22fe291-e3ab-4ef5-98b2-ee51b2bd9c72" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_e97b3b99-21ca-4d1e-ac65-3b063e4cb2d2" xlink:to="loc_us-gaap_OtherCommitmentsTable_a22fe291-e3ab-4ef5-98b2-ee51b2bd9c72" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_90deef8a-e26f-4b63-b5d2-df525d4111c4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_a22fe291-e3ab-4ef5-98b2-ee51b2bd9c72" xlink:to="loc_us-gaap_OtherCommitmentsAxis_90deef8a-e26f-4b63-b5d2-df525d4111c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_90deef8a-e26f-4b63-b5d2-df525d4111c4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_90deef8a-e26f-4b63-b5d2-df525d4111c4" xlink:to="loc_us-gaap_OtherCommitmentsDomain_90deef8a-e26f-4b63-b5d2-df525d4111c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_f69eb40a-bb05-4e44-a878-330185637e53" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_90deef8a-e26f-4b63-b5d2-df525d4111c4" xlink:to="loc_us-gaap_OtherCommitmentsDomain_f69eb40a-bb05-4e44-a878-330185637e53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d022f8fb-48a5-48ad-9094-87c35e95dae8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_a22fe291-e3ab-4ef5-98b2-ee51b2bd9c72" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d022f8fb-48a5-48ad-9094-87c35e95dae8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_d022f8fb-48a5-48ad-9094-87c35e95dae8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d022f8fb-48a5-48ad-9094-87c35e95dae8" xlink:to="loc_us-gaap_RelatedPartyDomain_d022f8fb-48a5-48ad-9094-87c35e95dae8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_9ae54e14-1665-42e4-b8f0-8fc10134a88b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_d022f8fb-48a5-48ad-9094-87c35e95dae8" xlink:to="loc_us-gaap_RelatedPartyDomain_9ae54e14-1665-42e4-b8f0-8fc10134a88b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_79ccb11a-94f9-4455-878d-d27093ac40eb" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_a22fe291-e3ab-4ef5-98b2-ee51b2bd9c72" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_79ccb11a-94f9-4455-878d-d27093ac40eb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_79ccb11a-94f9-4455-878d-d27093ac40eb_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_79ccb11a-94f9-4455-878d-d27093ac40eb" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_79ccb11a-94f9-4455-878d-d27093ac40eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_e34b5464-6eea-4208-86ed-791a5ac07820" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_79ccb11a-94f9-4455-878d-d27093ac40eb" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_e34b5464-6eea-4208-86ed-791a5ac07820" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/CommitmentsandContingenciesLegalEnvironmentalorRegulatoryDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#CommitmentsandContingenciesLegalEnvironmentalorRegulatoryDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/CommitmentsandContingenciesLegalEnvironmentalorRegulatoryDetails" xlink:type="extended" id="ib9157be62bcc4efa919b4e05737d0a3c_CommitmentsandContingenciesLegalEnvironmentalorRegulatoryDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccrualForEnvironmentalLossContingenciesGross_c1eff6d1-e0fc-47aa-b54f-9a778021d38d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccrualForEnvironmentalLossContingenciesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_AccrualForEnvironmentalLossContingenciesGross_c1eff6d1-e0fc-47aa-b54f-9a778021d38d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_bc970053-8687-450f-aeb4-64d803f86089" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedEnvironmentalLossContingenciesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_bc970053-8687-450f-aeb4-64d803f86089" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalLossContingencyCurrentStatementOfFinancialPositionExtensibleEnumeration_d24d88dc-7d17-481c-862c-57b9126ba0fb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EnvironmentalLossContingencyCurrentStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedEnvironmentalLossContingenciesCurrent_bc970053-8687-450f-aeb4-64d803f86089" xlink:to="loc_us-gaap_EnvironmentalLossContingencyCurrentStatementOfFinancialPositionExtensibleEnumeration_d24d88dc-7d17-481c-862c-57b9126ba0fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_a7c9f729-b3b4-45a4-a13f-42722ef12211" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_a7c9f729-b3b4-45a4-a13f-42722ef12211" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalLossContingencyNoncurrentStatementOfFinancialPositionExtensibleEnumeration_9227212d-da8e-4abd-899c-3ab74a2d6c96" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EnvironmentalLossContingencyNoncurrentStatementOfFinancialPositionExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent_a7c9f729-b3b4-45a4-a13f-42722ef12211" xlink:to="loc_us-gaap_EnvironmentalLossContingencyNoncurrentStatementOfFinancialPositionExtensibleEnumeration_9227212d-da8e-4abd-899c-3ab74a2d6c96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecordedThirdPartyEnvironmentalRecoveriesReceivable_0658ed56-44be-47fe-872b-47bd3ec4c6b3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RecordedThirdPartyEnvironmentalRecoveriesReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_RecordedThirdPartyEnvironmentalRecoveriesReceivable_0658ed56-44be-47fe-872b-47bd3ec4c6b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EstimatedSizeOfRelease_fef3212d-54a4-45d7-b0b4-d20b074738e4" xlink:href="paa-20221231.xsd#paa_EstimatedSizeOfRelease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_EstimatedSizeOfRelease_fef3212d-54a4-45d7-b0b4-d20b074738e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EstimatedSizeOfReleaseToReachBodyOfWater_e971467c-fff3-4c7d-b718-452afdb326d6" xlink:href="paa-20221231.xsd#paa_EstimatedSizeOfReleaseToReachBodyOfWater"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_EstimatedSizeOfReleaseToReachBodyOfWater_e971467c-fff3-4c7d-b718-452afdb326d6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesPaidValue_6e450ea5-6132-44ca-8812-9466fd1883ab" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyDamagesPaidValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingencyDamagesPaidValue_6e450ea5-6132-44ca-8812-9466fd1883ab" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IndictmentNumberofFelonyChargesGuiltyVerdict_36730e11-1e2f-4f1e-82a9-ad2ea0835d27" xlink:href="paa-20221231.xsd#paa_IndictmentNumberofFelonyChargesGuiltyVerdict"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_IndictmentNumberofFelonyChargesGuiltyVerdict_36730e11-1e2f-4f1e-82a9-ad2ea0835d27" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdict_6d0dc4f4-0f37-4889-902f-c1c7ca8811bd" xlink:href="paa-20221231.xsd#paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdict"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdict_6d0dc4f4-0f37-4889-902f-c1c7ca8811bd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictReportingCount_b48b5b2a-1fbb-4201-bd60-cea17f19b3b7" xlink:href="paa-20221231.xsd#paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictReportingCount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictReportingCount_b48b5b2a-1fbb-4201-bd60-cea17f19b3b7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictStrictLiabilityDischargeCount_20550a40-e2ed-4c2b-802a-95157e0e1699" xlink:href="paa-20221231.xsd#paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictStrictLiabilityDischargeCount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictStrictLiabilityDischargeCount_20550a40-e2ed-4c2b-802a-95157e0e1699" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictStrictLiabilityAnimalTakingsCount_aa20e9b1-cd40-4d97-9133-66874503e66e" xlink:href="paa-20221231.xsd#paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictStrictLiabilityAnimalTakingsCount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_IndictmentNumberofMisdemeanorChargesGuiltyVerdictStrictLiabilityAnimalTakingsCount_aa20e9b1-cd40-4d97-9133-66874503e66e" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IndictmentNumberofMisdemeanorChargesNotGuiltyVerdictStrictLiabilityAnimalTakingsCount_8f4d6b05-9a73-43ff-8ce3-e860f7670951" xlink:href="paa-20221231.xsd#paa_IndictmentNumberofMisdemeanorChargesNotGuiltyVerdictStrictLiabilityAnimalTakingsCount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_IndictmentNumberofMisdemeanorChargesNotGuiltyVerdictStrictLiabilityAnimalTakingsCount_8f4d6b05-9a73-43ff-8ce3-e860f7670951" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LossContingencyPenaltyOrFineAssessed_87ec2061-462a-44d0-a81d-0e08e4fe18b2" xlink:href="paa-20221231.xsd#paa_LossContingencyPenaltyOrFineAssessed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_LossContingencyPenaltyOrFineAssessed_87ec2061-462a-44d0-a81d-0e08e4fe18b2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesAwardedValue_b62a1c44-29a0-42fd-988e-3d63e83a18e8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyDamagesAwardedValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingencyDamagesAwardedValue_b62a1c44-29a0-42fd-988e-3d63e83a18e8" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_ac365d8d-3231-4e77-ba3f-8593d0f76112" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyPendingClaimsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_ac365d8d-3231-4e77-ba3f-8593d0f76112" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_7c2e094b-2f56-4d4d-98b6-e6adfd30a567" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_7c2e094b-2f56-4d4d-98b6-e6adfd30a567" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNewClaimsFiledNumber_a8b9e6ec-b380-49b9-b2ea-c8b366fe8b74" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNewClaimsFiledNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingencyNewClaimsFiledNumber_a8b9e6ec-b380-49b9-b2ea-c8b366fe8b74" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LitigationSettlementAmountAgreedUponSubjectToApproval_e3e32ac1-6306-4a93-8646-cc80fd8ec63a" xlink:href="paa-20221231.xsd#paa_LitigationSettlementAmountAgreedUponSubjectToApproval"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_LitigationSettlementAmountAgreedUponSubjectToApproval_e3e32ac1-6306-4a93-8646-cc80fd8ec63a" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForLegalSettlements_f3bb0c4f-1675-476a-80d9-1dfa3ba7e42b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PaymentsForLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_PaymentsForLegalSettlements_f3bb0c4f-1675-476a-80d9-1dfa3ba7e42b" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_9cd40918-6da3-4879-8596-0dbe24f5bf1d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_9cd40918-6da3-4879-8596-0dbe24f5bf1d" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_9e29ac44-54d2-4154-8d30-d9d5cb08fc92" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_9e29ac44-54d2-4154-8d30-d9d5cb08fc92" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LossContingencyExceededInsuranceCoverageLimit_4f4ffc52-0ca9-4392-8065-7594ae8221ed" xlink:href="paa-20221231.xsd#paa_LossContingencyExceededInsuranceCoverageLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_LossContingencyExceededInsuranceCoverageLimit_4f4ffc52-0ca9-4392-8065-7594ae8221ed" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InsuranceCoverageLimit_114fed16-0a48-4c07-a936-4e706d394930" xlink:href="paa-20221231.xsd#paa_InsuranceCoverageLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_InsuranceCoverageLimit_114fed16-0a48-4c07-a936-4e706d394930" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyReceivableProceeds_968d027b-74d5-439e-9fec-d3809ccda1b5" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyReceivableProceeds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingencyReceivableProceeds_968d027b-74d5-439e-9fec-d3809ccda1b5" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LossContingencyReceivedAndReceivable_29ea0db4-5ebf-4735-9d5f-31cb78678486" xlink:href="paa-20221231.xsd#paa_LossContingencyReceivedAndReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_LossContingencyReceivedAndReceivable_29ea0db4-5ebf-4735-9d5f-31cb78678486" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyReceivable_61152bb0-3c3b-4e4a-bed6-95e9fbb273e6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingencyReceivable_61152bb0-3c3b-4e4a-bed6-95e9fbb273e6" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters_851b4992-0713-44c6-be3e-0ca5c0dd532b" xlink:href="paa-20221231.xsd#paa_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_paa_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters_851b4992-0713-44c6-be3e-0ca5c0dd532b" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_72587749-9cbf-4e33-9277-22d1d3a9775d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_76a1100d-8557-4b58-91d5-6618ec132cc6" xlink:to="loc_us-gaap_LossContingenciesTable_72587749-9cbf-4e33-9277-22d1d3a9775d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationContingencyAxis_356cb512-888a-479d-a506-a6cf897e8a1a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EnvironmentalRemediationContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_72587749-9cbf-4e33-9277-22d1d3a9775d" xlink:to="loc_us-gaap_EnvironmentalRemediationContingencyAxis_356cb512-888a-479d-a506-a6cf897e8a1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationContingencyDomain_356cb512-888a-479d-a506-a6cf897e8a1a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EnvironmentalRemediationContingencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EnvironmentalRemediationContingencyAxis_356cb512-888a-479d-a506-a6cf897e8a1a" xlink:to="loc_us-gaap_EnvironmentalRemediationContingencyDomain_356cb512-888a-479d-a506-a6cf897e8a1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EnvironmentalRemediationContingencyDomain_9f8ce372-3950-4fe8-982a-0ebb417545ce" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EnvironmentalRemediationContingencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EnvironmentalRemediationContingencyAxis_356cb512-888a-479d-a506-a6cf897e8a1a" xlink:to="loc_us-gaap_EnvironmentalRemediationContingencyDomain_9f8ce372-3950-4fe8-982a-0ebb417545ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ExcludingLine901IncidentMember_221b7c0d-aabb-422d-ab20-8ca75224c91b" xlink:href="paa-20221231.xsd#paa_ExcludingLine901IncidentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EnvironmentalRemediationContingencyDomain_9f8ce372-3950-4fe8-982a-0ebb417545ce" xlink:to="loc_paa_ExcludingLine901IncidentMember_221b7c0d-aabb-422d-ab20-8ca75224c91b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_e89b4f6b-3abe-4a11-9679-0ecf1033eefc" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_72587749-9cbf-4e33-9277-22d1d3a9775d" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_e89b4f6b-3abe-4a11-9679-0ecf1033eefc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_e89b4f6b-3abe-4a11-9679-0ecf1033eefc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_e89b4f6b-3abe-4a11-9679-0ecf1033eefc" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_e89b4f6b-3abe-4a11-9679-0ecf1033eefc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_49b61105-29c9-4681-b4d1-3c2289ed7ed1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_e89b4f6b-3abe-4a11-9679-0ecf1033eefc" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_49b61105-29c9-4681-b4d1-3c2289ed7ed1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_6f4e082d-26e4-4462-afcb-5a741e33ebcb" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_49b61105-29c9-4681-b4d1-3c2289ed7ed1" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_6f4e082d-26e4-4462-afcb-5a741e33ebcb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_TradeAccountsPayableAndOtherCurrentLiabilitiesMember_07af3f3a-352a-4880-a816-c2e2fd2dca95" xlink:href="paa-20221231.xsd#paa_TradeAccountsPayableAndOtherCurrentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_49b61105-29c9-4681-b4d1-3c2289ed7ed1" xlink:to="loc_paa_TradeAccountsPayableAndOtherCurrentLiabilitiesMember_07af3f3a-352a-4880-a816-c2e2fd2dca95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_d2d7148a-bbac-43f2-8df9-6fe3ca62a48d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_72587749-9cbf-4e33-9277-22d1d3a9775d" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_d2d7148a-bbac-43f2-8df9-6fe3ca62a48d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_d2d7148a-bbac-43f2-8df9-6fe3ca62a48d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_d2d7148a-bbac-43f2-8df9-6fe3ca62a48d" xlink:to="loc_us-gaap_LossContingencyNatureDomain_d2d7148a-bbac-43f2-8df9-6fe3ca62a48d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_98c92136-c1d3-4d6e-b32c-888eafb6ff99" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_d2d7148a-bbac-43f2-8df9-6fe3ca62a48d" xlink:to="loc_us-gaap_LossContingencyNatureDomain_98c92136-c1d3-4d6e-b32c-888eafb6ff99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_Line901IncidentMember_87bc5585-42ee-459a-9aad-450b8033caa5" xlink:href="paa-20221231.xsd#paa_Line901IncidentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_98c92136-c1d3-4d6e-b32c-888eafb6ff99" xlink:to="loc_paa_Line901IncidentMember_87bc5585-42ee-459a-9aad-450b8033caa5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ClaimForReimbursementFromInsuranceMember_8a2b63dc-448d-4cd0-9c65-a73be7f31b1f" xlink:href="paa-20221231.xsd#paa_ClaimForReimbursementFromInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_Line901IncidentMember_87bc5585-42ee-459a-9aad-450b8033caa5" xlink:to="loc_paa_ClaimForReimbursementFromInsuranceMember_8a2b63dc-448d-4cd0-9c65-a73be7f31b1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DenialOfInsuranceCoverageMember_3161f7f7-ce8e-4644-b287-00ac3734952b" xlink:href="paa-20221231.xsd#paa_DenialOfInsuranceCoverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ClaimForReimbursementFromInsuranceMember_8a2b63dc-448d-4cd0-9c65-a73be7f31b1f" xlink:to="loc_paa_DenialOfInsuranceCoverageMember_3161f7f7-ce8e-4644-b287-00ac3734952b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ResponseToRequestForReimbursementNotReceivedMember_71b869e1-fb45-4484-bd6b-88c17318a90d" xlink:href="paa-20221231.xsd#paa_ResponseToRequestForReimbursementNotReceivedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ClaimForReimbursementFromInsuranceMember_8a2b63dc-448d-4cd0-9c65-a73be7f31b1f" xlink:to="loc_paa_ResponseToRequestForReimbursementNotReceivedMember_71b869e1-fb45-4484-bd6b-88c17318a90d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_ce6d673d-f799-42de-ba95-f4b6e767ac45" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_72587749-9cbf-4e33-9277-22d1d3a9775d" xlink:to="loc_srt_LitigationCaseAxis_ce6d673d-f799-42de-ba95-f4b6e767ac45" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_ce6d673d-f799-42de-ba95-f4b6e767ac45_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_ce6d673d-f799-42de-ba95-f4b6e767ac45" xlink:to="loc_srt_LitigationCaseTypeDomain_ce6d673d-f799-42de-ba95-f4b6e767ac45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_c74293a7-8cea-4773-b09b-029546ded129" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_ce6d673d-f799-42de-ba95-f4b6e767ac45" xlink:to="loc_srt_LitigationCaseTypeDomain_c74293a7-8cea-4773-b09b-029546ded129" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ConsentDecreeCivilPenaltiesMember_fe6112ac-011f-44f2-8abf-df01d163424c" xlink:href="paa-20221231.xsd#paa_ConsentDecreeCivilPenaltiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_c74293a7-8cea-4773-b09b-029546ded129" xlink:to="loc_paa_ConsentDecreeCivilPenaltiesMember_fe6112ac-011f-44f2-8abf-df01d163424c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ConsentDecreeCompensationForInjuriesToDestructionOfLossOfUseOfNaturalResourcesMember_2d44641f-fba8-4db4-a4c2-30535b72ddeb" xlink:href="paa-20221231.xsd#paa_ConsentDecreeCompensationForInjuriesToDestructionOfLossOfUseOfNaturalResourcesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_c74293a7-8cea-4773-b09b-029546ded129" xlink:to="loc_paa_ConsentDecreeCompensationForInjuriesToDestructionOfLossOfUseOfNaturalResourcesMember_2d44641f-fba8-4db4-a4c2-30535b72ddeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_IndictmentInCaliforniaSuperiorCourtSantaBarbaraCountyMember_5beaa5a0-9227-4509-91f6-f1aa4de16301" xlink:href="paa-20221231.xsd#paa_IndictmentInCaliforniaSuperiorCourtSantaBarbaraCountyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_c74293a7-8cea-4773-b09b-029546ded129" xlink:to="loc_paa_IndictmentInCaliforniaSuperiorCourtSantaBarbaraCountyMember_5beaa5a0-9227-4509-91f6-f1aa4de16301" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ClassActionLawsuitsMember_99e5784c-4670-4338-a371-04d7e2cdbb0a" xlink:href="paa-20221231.xsd#paa_ClassActionLawsuitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_c74293a7-8cea-4773-b09b-029546ded129" xlink:to="loc_paa_ClassActionLawsuitsMember_99e5784c-4670-4338-a371-04d7e2cdbb0a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_ClassActionLawsuitClaimOfDamagesMember_5eabc9b8-83a7-4434-a736-737b0abc65b4" xlink:href="paa-20221231.xsd#paa_ClassActionLawsuitClaimOfDamagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_paa_ClassActionLawsuitsMember_99e5784c-4670-4338-a371-04d7e2cdbb0a" xlink:to="loc_paa_ClassActionLawsuitClaimOfDamagesMember_5eabc9b8-83a7-4434-a736-737b0abc65b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_UnitholderDerivativeLawsuitsMember_e3dfe74e-d9f8-4ee1-8c86-539a6aba4e32" xlink:href="paa-20221231.xsd#paa_UnitholderDerivativeLawsuitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_c74293a7-8cea-4773-b09b-029546ded129" xlink:to="loc_paa_UnitholderDerivativeLawsuitsMember_e3dfe74e-d9f8-4ee1-8c86-539a6aba4e32" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_912ace8d-f454-4c9a-9cdb-7feb52c11312" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_72587749-9cbf-4e33-9277-22d1d3a9775d" xlink:to="loc_srt_RangeAxis_912ace8d-f454-4c9a-9cdb-7feb52c11312" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_912ace8d-f454-4c9a-9cdb-7feb52c11312_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_912ace8d-f454-4c9a-9cdb-7feb52c11312" xlink:to="loc_srt_RangeMember_912ace8d-f454-4c9a-9cdb-7feb52c11312_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c2eb4388-0844-4c0a-b820-5ae42311147a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_912ace8d-f454-4c9a-9cdb-7feb52c11312" xlink:to="loc_srt_RangeMember_c2eb4388-0844-4c0a-b820-5ae42311147a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9cc61f1e-2d49-49b2-8e77-4fbc78b27667" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c2eb4388-0844-4c0a-b820-5ae42311147a" xlink:to="loc_srt_MaximumMember_9cc61f1e-2d49-49b2-8e77-4fbc78b27667" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_c4f988e0-cc67-4861-b7e9-e540737db992" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_72587749-9cbf-4e33-9277-22d1d3a9775d" xlink:to="loc_us-gaap_LitigationStatusAxis_c4f988e0-cc67-4861-b7e9-e540737db992" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_c4f988e0-cc67-4861-b7e9-e540737db992_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_c4f988e0-cc67-4861-b7e9-e540737db992" xlink:to="loc_us-gaap_LitigationStatusDomain_c4f988e0-cc67-4861-b7e9-e540737db992_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_f78c10c8-0cc3-477a-b452-4326a7d9860c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_c4f988e0-cc67-4861-b7e9-e540737db992" xlink:to="loc_us-gaap_LitigationStatusDomain_f78c10c8-0cc3-477a-b452-4326a7d9860c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_JudicialRulingMember_dc6cd25f-21d7-4766-b3cb-386a75903c58" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_JudicialRulingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_f78c10c8-0cc3-477a-b452-4326a7d9860c" xlink:to="loc_us-gaap_JudicialRulingMember_dc6cd25f-21d7-4766-b3cb-386a75903c58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_6621afe8-9e03-48e9-a06b-d8106dc10b56" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PendingLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_f78c10c8-0cc3-477a-b452-4326a7d9860c" xlink:to="loc_us-gaap_PendingLitigationMember_6621afe8-9e03-48e9-a06b-d8106dc10b56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SettledLitigationMember_15f2793c-25a8-4de0-975b-22e011bbb6ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SettledLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_f78c10c8-0cc3-477a-b452-4326a7d9860c" xlink:to="loc_us-gaap_SettledLitigationMember_15f2793c-25a8-4de0-975b-22e011bbb6ec" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/SegmentInformationSegmentFinancialDataDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#SegmentInformationSegmentFinancialDataDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/SegmentInformationSegmentFinancialDataDetails" xlink:type="extended" id="id690c48a5b19428e8c085be7b8ac8fb3_SegmentInformationSegmentFinancialDataDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_baf78e6e-3354-4840-ba7b-80172b3c77d4" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationRevenueAbstract_426f4362-a526-4481-8a18-657a9b46f2bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingInformationRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_baf78e6e-3354-4840-ba7b-80172b3c77d4" xlink:to="loc_us-gaap_SegmentReportingInformationRevenueAbstract_426f4362-a526-4481-8a18-657a9b46f2bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_5f1270f5-a52f-45ab-b609-b919cf4b14d1" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationRevenueAbstract_426f4362-a526-4481-8a18-657a9b46f2bd" xlink:to="loc_us-gaap_Revenues_5f1270f5-a52f-45ab-b609-b919cf4b14d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingDisclosureOfOtherInformationAboutEntitysReportableSegmentsAbstract_5b892787-342d-49cc-a3af-3e1f945c68ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingDisclosureOfOtherInformationAboutEntitysReportableSegmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_baf78e6e-3354-4840-ba7b-80172b3c77d4" xlink:to="loc_us-gaap_SegmentReportingDisclosureOfOtherInformationAboutEntitysReportableSegmentsAbstract_5b892787-342d-49cc-a3af-3e1f945c68ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_3a63225d-75a9-48a2-b417-ef22553aa7fa" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfOtherInformationAboutEntitysReportableSegmentsAbstract_5b892787-342d-49cc-a3af-3e1f945c68ec" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_3a63225d-75a9-48a2-b417-ef22553aa7fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SegmentAdjustedEBITDA_8be5a507-c8ef-49e4-8cb3-cfa30a72ddeb" xlink:href="paa-20221231.xsd#paa_SegmentAdjustedEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfOtherInformationAboutEntitysReportableSegmentsAbstract_5b892787-342d-49cc-a3af-3e1f945c68ec" xlink:to="loc_paa_SegmentAdjustedEBITDA_8be5a507-c8ef-49e4-8cb3-cfa30a72ddeb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_InvestmentAndAcquisitionCapitalExpenditures_413f4d81-72ca-42cd-8f9a-0023e6b5a5c3" xlink:href="paa-20221231.xsd#paa_InvestmentAndAcquisitionCapitalExpenditures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfOtherInformationAboutEntitysReportableSegmentsAbstract_5b892787-342d-49cc-a3af-3e1f945c68ec" xlink:to="loc_paa_InvestmentAndAcquisitionCapitalExpenditures_413f4d81-72ca-42cd-8f9a-0023e6b5a5c3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_MaintenanceCapitalExpenditures_3cb3e74a-2b9f-4598-9dd5-ccc52c0af00d" xlink:href="paa-20221231.xsd#paa_MaintenanceCapitalExpenditures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfOtherInformationAboutEntitysReportableSegmentsAbstract_5b892787-342d-49cc-a3af-3e1f945c68ec" xlink:to="loc_paa_MaintenanceCapitalExpenditures_3cb3e74a-2b9f-4598-9dd5-ccc52c0af00d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_c0d59cff-2ee9-49ef-94e6-55e8d78c653d" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingDisclosureOfOtherInformationAboutEntitysReportableSegmentsAbstract_5b892787-342d-49cc-a3af-3e1f945c68ec" xlink:to="loc_us-gaap_EquityMethodInvestments_c0d59cff-2ee9-49ef-94e6-55e8d78c653d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_93dae20e-5623-4cc3-ac9c-e71d956377bd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_baf78e6e-3354-4840-ba7b-80172b3c77d4" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_93dae20e-5623-4cc3-ac9c-e71d956377bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6410e3a8-6ec2-4c20-a47a-06b9876f0d12" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_93dae20e-5623-4cc3-ac9c-e71d956377bd" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6410e3a8-6ec2-4c20-a47a-06b9876f0d12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6410e3a8-6ec2-4c20-a47a-06b9876f0d12_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6410e3a8-6ec2-4c20-a47a-06b9876f0d12" xlink:to="loc_us-gaap_SegmentDomain_6410e3a8-6ec2-4c20-a47a-06b9876f0d12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_980b01f9-8587-40db-842d-ae3ca26c1cb6" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6410e3a8-6ec2-4c20-a47a-06b9876f0d12" xlink:to="loc_us-gaap_SegmentDomain_980b01f9-8587-40db-842d-ae3ca26c1cb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_CrudeOilSegmentMember_b5490b0b-4ce2-465f-8ed6-8770238626a0" xlink:href="paa-20221231.xsd#paa_CrudeOilSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_980b01f9-8587-40db-842d-ae3ca26c1cb6" xlink:to="loc_paa_CrudeOilSegmentMember_b5490b0b-4ce2-465f-8ed6-8770238626a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NaturalGasLiquidsSegmentMember_2805cf6e-0668-4ba2-9466-1979335c715f" xlink:href="paa-20221231.xsd#paa_NaturalGasLiquidsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_980b01f9-8587-40db-842d-ae3ca26c1cb6" xlink:to="loc_paa_NaturalGasLiquidsSegmentMember_2805cf6e-0668-4ba2-9466-1979335c715f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_6094ae51-ff56-4660-8fa9-cdbd50d6787c" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_93dae20e-5623-4cc3-ac9c-e71d956377bd" xlink:to="loc_srt_ProductOrServiceAxis_6094ae51-ff56-4660-8fa9-cdbd50d6787c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6094ae51-ff56-4660-8fa9-cdbd50d6787c_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_6094ae51-ff56-4660-8fa9-cdbd50d6787c" xlink:to="loc_srt_ProductsAndServicesDomain_6094ae51-ff56-4660-8fa9-cdbd50d6787c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_aff9787e-8c60-45d4-af8c-3c503a6288d1" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_6094ae51-ff56-4660-8fa9-cdbd50d6787c" xlink:to="loc_srt_ProductsAndServicesDomain_aff9787e-8c60-45d4-af8c-3c503a6288d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductMember_80a05130-3a7f-4f2b-a6b3-96cf749770a3" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProductMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_aff9787e-8c60-45d4-af8c-3c503a6288d1" xlink:to="loc_us-gaap_ProductMember_80a05130-3a7f-4f2b-a6b3-96cf749770a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceMember_6f859cc1-f8bc-4936-a97f-c776423bfba9" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_aff9787e-8c60-45d4-af8c-3c503a6288d1" xlink:to="loc_us-gaap_ServiceMember_6f859cc1-f8bc-4936-a97f-c776423bfba9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_d7af9ce7-cfde-4f5a-ac3b-710ea495ee67" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_93dae20e-5623-4cc3-ac9c-e71d956377bd" xlink:to="loc_srt_ConsolidationItemsAxis_d7af9ce7-cfde-4f5a-ac3b-710ea495ee67" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_d7af9ce7-cfde-4f5a-ac3b-710ea495ee67_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_d7af9ce7-cfde-4f5a-ac3b-710ea495ee67" xlink:to="loc_srt_ConsolidationItemsDomain_d7af9ce7-cfde-4f5a-ac3b-710ea495ee67_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_e9babae2-08e9-4104-9d59-37dfbcc64f6a" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_d7af9ce7-cfde-4f5a-ac3b-710ea495ee67" xlink:to="loc_srt_ConsolidationItemsDomain_e9babae2-08e9-4104-9d59-37dfbcc64f6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_aec6054b-d182-42d6-9ca8-cf6e984dbd76" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_e9babae2-08e9-4104-9d59-37dfbcc64f6a" xlink:to="loc_us-gaap_OperatingSegmentsMember_aec6054b-d182-42d6-9ca8-cf6e984dbd76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntersegmentEliminationMember_a8dc96be-0f5c-4561-aeba-b8426bc58d11" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_e9babae2-08e9-4104-9d59-37dfbcc64f6a" xlink:to="loc_us-gaap_IntersegmentEliminationMember_a8dc96be-0f5c-4561-aeba-b8426bc58d11" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/SegmentInformationReconciliationofSegmentAdjustedEBITDADetails" xlink:type="simple" xlink:href="paa-20221231.xsd#SegmentInformationReconciliationofSegmentAdjustedEBITDADetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/SegmentInformationReconciliationofSegmentAdjustedEBITDADetails" xlink:type="extended" id="ie13c0c75ec8947ecbd578c29710ea309_SegmentInformationReconciliationofSegmentAdjustedEBITDADetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_f25eec35-a2c6-4e77-8c18-11fe6363b37f" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SegmentAdjustedEBITDA_57561afe-04ac-421c-9338-4c8cdd31b2c7" xlink:href="paa-20221231.xsd#paa_SegmentAdjustedEBITDA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_f25eec35-a2c6-4e77-8c18-11fe6363b37f" xlink:to="loc_paa_SegmentAdjustedEBITDA_57561afe-04ac-421c-9338-4c8cdd31b2c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_f25eec35-a2c6-4e77-8c18-11fe6363b37f" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DepreciationAndAmortizationOfUnconsolidatedEntities_9db630d4-0ff5-4a8e-bad6-c7cba5e3df8c" xlink:href="paa-20221231.xsd#paa_DepreciationAndAmortizationOfUnconsolidatedEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_DepreciationAndAmortizationOfUnconsolidatedEntities_9db630d4-0ff5-4a8e-bad6-c7cba5e3df8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainsLossesFromDerivativeActivitiesAndInventoryValuationAdjustments_a597eb10-6eb2-48d1-b616-109769f9c8f4" xlink:href="paa-20221231.xsd#paa_GainsLossesFromDerivativeActivitiesAndInventoryValuationAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_GainsLossesFromDerivativeActivitiesAndInventoryValuationAdjustments_a597eb10-6eb2-48d1-b616-109769f9c8f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_LongTermInventoryCostingAdjustments_44356d4c-ffbd-4da3-bd91-ee4ae9cb9d48" xlink:href="paa-20221231.xsd#paa_LongTermInventoryCostingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_LongTermInventoryCostingAdjustments_44356d4c-ffbd-4da3-bd91-ee4ae9cb9d48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_DeficienciesUnderMinimumVolumeCommitmentsNet_54d7a403-0db4-43af-b88b-7de8a525a7c1" xlink:href="paa-20221231.xsd#paa_DeficienciesUnderMinimumVolumeCommitmentsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_DeficienciesUnderMinimumVolumeCommitmentsNet_54d7a403-0db4-43af-b88b-7de8a525a7c1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_EquityIndexedCompensationExpenseAwardsThatWillOrMayBeSettledInUnits_cb35bfa8-b0cb-46f7-927f-8cb2d8bd61a8" xlink:href="paa-20221231.xsd#paa_EquityIndexedCompensationExpenseAwardsThatWillOrMayBeSettledInUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_EquityIndexedCompensationExpenseAwardsThatWillOrMayBeSettledInUnits_cb35bfa8-b0cb-46f7-927f-8cb2d8bd61a8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_NetGainLossOnForeignCurrencyRevaluation_61060954-5238-4df0-97bf-b1edb2a34e8b" xlink:href="paa-20221231.xsd#paa_NetGainLossOnForeignCurrencyRevaluation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_NetGainLossOnForeignCurrencyRevaluation_61060954-5238-4df0-97bf-b1edb2a34e8b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters_dd171650-c9f8-48cc-a76c-bf6f70020d98" xlink:href="paa-20221231.xsd#paa_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_SignificantCostsRelatedToLegalAndEnvironmentalRemediationMatters_dd171650-c9f8-48cc-a76c-bf6f70020d98" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_SignificantTransactionRelatedExpenses_77fbad85-979c-45ad-832a-51ac61055644" xlink:href="paa-20221231.xsd#paa_SignificantTransactionRelatedExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_SignificantTransactionRelatedExpenses_77fbad85-979c-45ad-832a-51ac61055644" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_AdjustedEBITDAAttributableToNoncontrollingInterests_04b31d08-250a-49f4-a7c6-245be24cd93c" xlink:href="paa-20221231.xsd#paa_AdjustedEBITDAAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_AdjustedEBITDAAttributableToNoncontrollingInterests_04b31d08-250a-49f4-a7c6-245be24cd93c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_9f9f7a89-6f8c-41a3-8edf-2784cb8d0d18" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_DepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_9f9f7a89-6f8c-41a3-8edf-2784cb8d0d18" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_cd456c73-3426-445e-b3a5-5a198680e570" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_cd456c73-3426-445e-b3a5-5a198680e570" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_0034ee04-c391-4fdb-bdc7-bce7930e8c59" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_0034ee04-c391-4fdb-bdc7-bce7930e8c59" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet_1b65bf25-86db-4fd0-921f-302931ab1682" xlink:href="paa-20221231.xsd#paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_paa_GainsLossesOnimpairmentOfInvestmentsInUnconsolidatedEntitiesNet_1b65bf25-86db-4fd0-921f-302931ab1682" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_7e650e76-d5a7-40e6-b425-1f4d7238fbb8" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_InterestExpense_7e650e76-d5a7-40e6-b425-1f4d7238fbb8" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_dce54030-628e-45de-ba15-602a2be8fd2c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_dce54030-628e-45de-ba15-602a2be8fd2c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_81ecfe24-fa77-4ee5-9c2a-d7cfc0076b00" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_81ecfe24-fa77-4ee5-9c2a-d7cfc0076b00" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_a632f4a0-1753-433f-9814-da1b78cb48ec" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_a632f4a0-1753-433f-9814-da1b78cb48ec" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_6d28fd2e-2751-4480-95f2-364477dca453" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_ProfitLoss_6d28fd2e-2751-4480-95f2-364477dca453" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_872d2e3c-fcb8-4896-8fe1-eca48fd91106" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_872d2e3c-fcb8-4896-8fe1-eca48fd91106" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_bc3e852d-6532-4c6f-88b4-c61f4bde7310" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedAbstract_4c3eff23-3944-44db-872b-0584a70e198a" xlink:to="loc_us-gaap_NetIncomeLoss_bc3e852d-6532-4c6f-88b4-c61f4bde7310" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_c258ec56-5fc9-4762-af44-e691580798cf" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems_f25eec35-a2c6-4e77-8c18-11fe6363b37f" xlink:to="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_c258ec56-5fc9-4762-af44-e691580798cf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_aaa45c6b-9536-4b06-9999-0ac42fd1612c" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable_c258ec56-5fc9-4762-af44-e691580798cf" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_aaa45c6b-9536-4b06-9999-0ac42fd1612c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_aaa45c6b-9536-4b06-9999-0ac42fd1612c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_aaa45c6b-9536-4b06-9999-0ac42fd1612c" xlink:to="loc_us-gaap_LossContingencyNatureDomain_aaa45c6b-9536-4b06-9999-0ac42fd1612c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_52d9aa35-01b4-4e42-92a1-583561a3e1af" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_aaa45c6b-9536-4b06-9999-0ac42fd1612c" xlink:to="loc_us-gaap_LossContingencyNatureDomain_52d9aa35-01b4-4e42-92a1-583561a3e1af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_paa_Line901IncidentMember_20a36885-fd3f-4380-9479-e57897ea32fb" xlink:href="paa-20221231.xsd#paa_Line901IncidentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_52d9aa35-01b4-4e42-92a1-583561a3e1af" xlink:to="loc_paa_Line901IncidentMember_20a36885-fd3f-4380-9479-e57897ea32fb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.paalp.com/role/SegmentInformationGeographicDataDetails" xlink:type="simple" xlink:href="paa-20221231.xsd#SegmentInformationGeographicDataDetails"/>
  <link:definitionLink xlink:role="http://www.paalp.com/role/SegmentInformationGeographicDataDetails" xlink:type="extended" id="if0baf817d6254e9586df19357d84a101_SegmentInformationGeographicDataDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_eee5467f-d4b3-4799-aef1-37edb66e9b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_3db45aa3-0b2b-4bc8-bd37-6b81057694fd" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_eee5467f-d4b3-4799-aef1-37edb66e9b1b" xlink:to="loc_us-gaap_Revenues_3db45aa3-0b2b-4bc8-bd37-6b81057694fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_54661136-b8c7-4cbc-bb7c-d5f726d81f28" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_eee5467f-d4b3-4799-aef1-37edb66e9b1b" xlink:to="loc_us-gaap_NoncurrentAssets_54661136-b8c7-4cbc-bb7c-d5f726d81f28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_01f13e29-6112-47bd-bf0a-9e1f1de9e109" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_eee5467f-d4b3-4799-aef1-37edb66e9b1b" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_01f13e29-6112-47bd-bf0a-9e1f1de9e109" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_55d82c98-77fa-4a30-8e7a-f1a5072baa2b" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_01f13e29-6112-47bd-bf0a-9e1f1de9e109" xlink:to="loc_srt_StatementGeographicalAxis_55d82c98-77fa-4a30-8e7a-f1a5072baa2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_55d82c98-77fa-4a30-8e7a-f1a5072baa2b_default" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_55d82c98-77fa-4a30-8e7a-f1a5072baa2b" xlink:to="loc_srt_SegmentGeographicalDomain_55d82c98-77fa-4a30-8e7a-f1a5072baa2b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_81d95b49-4bcd-4158-a095-0f42ccc1b3e9" xlink:href="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_55d82c98-77fa-4a30-8e7a-f1a5072baa2b" xlink:to="loc_srt_SegmentGeographicalDomain_81d95b49-4bcd-4158-a095-0f42ccc1b3e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_baa8336d-cee3-489e-9401-4ca411468669" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_81d95b49-4bcd-4158-a095-0f42ccc1b3e9" xlink:to="loc_country_US_baa8336d-cee3-489e-9401-4ca411468669" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_5739803f-8d92-446d-badd-9f094fc24a1d" xlink:href="https://xbrl.sec.gov/country/2022/country-2022.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_81d95b49-4bcd-4158-a095-0f42ccc1b3e9" xlink:to="loc_country_CA_5739803f-8d92-446d-badd-9f094fc24a1d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-roles-2022.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
