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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e043a-e369-743f-9605-ac1588eebef8,g:4c42a569-5bb9-4981-a9a0-e0eb53902541-->
<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.usacompression.com/role/UnauditedCondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="usac-20260630.xsd#UnauditedCondensedConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/UnauditedCondensedConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e043a-e449-7609-9645-99e4386faf96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e043a-e449-7d7f-9ac7-6c07c5c4512e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7609-9645-99e4386faf96" xlink:to="loc_us-gaap_StatementTable_019e043a-e449-7d7f-9ac7-6c07c5c4512e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e449-7762-8290-c4099b7f221e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e043a-e449-7d7f-9ac7-6c07c5c4512e" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e449-7762-8290-c4099b7f221e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e043a-e449-7762-8290-c4099b7f221e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e449-7762-8290-c4099b7f221e" xlink:to="loc_us-gaap_RelatedPartyDomain_019e043a-e449-7762-8290-c4099b7f221e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e043a-e449-7fad-afbb-4606ebdf2a27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e449-7762-8290-c4099b7f221e" xlink:to="loc_us-gaap_RelatedPartyDomain_019e043a-e449-7fad-afbb-4606ebdf2a27" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_019e043a-e449-7239-8a30-dfb73de180cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019e043a-e449-7fad-afbb-4606ebdf2a27" xlink:to="loc_us-gaap_NonrelatedPartyMember_019e043a-e449-7239-8a30-dfb73de180cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019e043a-e449-7544-8216-cdf6797c91ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019e043a-e449-7fad-afbb-4606ebdf2a27" xlink:to="loc_us-gaap_RelatedPartyMember_019e043a-e449-7544-8216-cdf6797c91ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7609-9645-99e4386faf96" xlink:to="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_019e043a-e449-7a6e-8ed9-300ced4f3623" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:to="loc_us-gaap_AssetsCurrentAbstract_019e043a-e449-7a6e-8ed9-300ced4f3623" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e043a-e449-7e3f-b747-f8a549c5fa17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019e043a-e449-7a6e-8ed9-300ced4f3623" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019e043a-e449-7e3f-b747-f8a549c5fa17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019e043a-e449-75d9-ac84-213e4bc7ea46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019e043a-e449-7a6e-8ed9-300ced4f3623" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019e043a-e449-75d9-ac84-213e4bc7ea46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_019e043a-e449-77c9-8158-73b6909461d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019e043a-e449-7a6e-8ed9-300ced4f3623" xlink:to="loc_us-gaap_InventoryNet_019e043a-e449-77c9-8158-73b6909461d5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019e043a-e449-75c4-b027-344344229b6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019e043a-e449-7a6e-8ed9-300ced4f3623" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_019e043a-e449-75c4-b027-344344229b6b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_019e043a-e449-7437-b698-bb9a1524ee69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_019e043a-e449-7a6e-8ed9-300ced4f3623" xlink:to="loc_us-gaap_AssetsCurrent_019e043a-e449-7437-b698-bb9a1524ee69" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e043a-e449-7612-9f67-1bdb70260f12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e043a-e449-7612-9f67-1bdb70260f12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_019e043a-e449-7e35-8753-a663f1bf6796" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_019e043a-e449-7e35-8753-a663f1bf6796" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e043a-e449-7c5a-8a95-502e066d2631" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e043a-e449-7c5a-8a95-502e066d2631" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_019e043a-e449-78e7-b52c-2677215efb54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_019e043a-e449-78e7-b52c-2677215efb54" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e043a-e449-7c63-8d31-abd96475048b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:to="loc_us-gaap_Goodwill_019e043a-e449-7c63-8d31-abd96475048b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019e043a-e449-7cda-a6a3-056534e9acc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019e043a-e449-7da8-a86b-981fc0f1b863" xlink:to="loc_us-gaap_Assets_019e043a-e449-7cda-a6a3-056534e9acc5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7609-9645-99e4386faf96" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_019e043a-e449-7ee2-a269-b5a61aa7fbbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_019e043a-e449-7ee2-a269-b5a61aa7fbbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019e043a-e449-77dc-885e-fdf7a8e4bfd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019e043a-e449-7ee2-a269-b5a61aa7fbbc" xlink:to="loc_us-gaap_AccountsPayableCurrent_019e043a-e449-77dc-885e-fdf7a8e4bfd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_019e043a-e449-7d28-bcf6-dd5012d339c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019e043a-e449-7ee2-a269-b5a61aa7fbbc" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_019e043a-e449-7d28-bcf6-dd5012d339c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019e043a-e449-7691-8535-522b5d160b25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019e043a-e449-7ee2-a269-b5a61aa7fbbc" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_019e043a-e449-7691-8535-522b5d160b25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_019e043a-e449-7d3a-bb0c-01368e3de90c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_019e043a-e449-7ee2-a269-b5a61aa7fbbc" xlink:to="loc_us-gaap_LiabilitiesCurrent_019e043a-e449-7d3a-bb0c-01368e3de90c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_019e043a-e449-7e5c-a801-0bfb86046b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_019e043a-e449-7e5c-a801-0bfb86046b1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019e043a-e449-7869-93fc-8dcedf87eea6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_019e043a-e449-7869-93fc-8dcedf87eea6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019e043a-e449-75c1-98f2-28a1805fbb41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019e043a-e449-75c1-98f2-28a1805fbb41" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019e043a-e449-70a7-b9df-2d752e48cef4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_OtherLiabilities_019e043a-e449-70a7-b9df-2d752e48cef4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019e043a-e449-73f6-83c5-9a0780449495" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_Liabilities_019e043a-e449-73f6-83c5-9a0780449495" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019e043a-e449-7302-aa06-0ce410baee22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019e043a-e449-7302-aa06-0ce410baee22" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAbstract_019e043a-e449-76f8-a62b-0ce54911a476" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnersCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_PartnersCapitalAbstract_019e043a-e449-76f8-a62b-0ce54911a476" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccount_019e043a-e449-7f62-84ee-ccd51bbdc4df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnersCapitalAbstract_019e043a-e449-76f8-a62b-0ce54911a476" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccount_019e043a-e449-7f62-84ee-ccd51bbdc4df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e043a-e449-760d-a64e-a40ff59645c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019e043a-e449-73a1-b53d-9d6593d54c8f" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019e043a-e449-760d-a64e-a40ff59645c6" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/UnauditedCondensedConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="usac-20260630.xsd#UnauditedCondensedConsolidatedStatementsofOperations"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/UnauditedCondensedConsolidatedStatementsofOperations" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e043a-e449-715f-aae2-41c7f77e31eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e043a-e449-793b-b6b3-10c0a6ab51e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-715f-aae2-41c7f77e31eb" xlink:to="loc_us-gaap_StatementTable_019e043a-e449-793b-b6b3-10c0a6ab51e6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_ContractWithCustomerContractByTimingOfTransferOfGoodOrServiceOrByCustomerTypeAxis_019e043a-e449-7054-a304-3a616f7ff7e6" xlink:href="usac-20260630.xsd#usac_ContractWithCustomerContractByTimingOfTransferOfGoodOrServiceOrByCustomerTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e043a-e449-793b-b6b3-10c0a6ab51e6" xlink:to="loc_usac_ContractWithCustomerContractByTimingOfTransferOfGoodOrServiceOrByCustomerTypeAxis_019e043a-e449-7054-a304-3a616f7ff7e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain_019e043a-e449-7054-a304-3a616f7ff7e6_default" xlink:href="usac-20260630.xsd#usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_usac_ContractWithCustomerContractByTimingOfTransferOfGoodOrServiceOrByCustomerTypeAxis_019e043a-e449-7054-a304-3a616f7ff7e6" xlink:to="loc_usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain_019e043a-e449-7054-a304-3a616f7ff7e6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain_019e043a-e449-7f97-98ed-042b9e2557ad" xlink:href="usac-20260630.xsd#usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_usac_ContractWithCustomerContractByTimingOfTransferOfGoodOrServiceOrByCustomerTypeAxis_019e043a-e449-7054-a304-3a616f7ff7e6" xlink:to="loc_usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain_019e043a-e449-7f97-98ed-042b9e2557ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_RevenueFromContractOperationsExcludingRevenueFromRelatedPartyMember_019e043a-e449-7aa7-8424-d6875e3beac0" xlink:href="usac-20260630.xsd#usac_RevenueFromContractOperationsExcludingRevenueFromRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain_019e043a-e449-7f97-98ed-042b9e2557ad" xlink:to="loc_usac_RevenueFromContractOperationsExcludingRevenueFromRelatedPartyMember_019e043a-e449-7aa7-8424-d6875e3beac0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_RevenueFromPartsAndServiceExcludingRevenueFromRelatedPartyMember_019e043a-e449-7ef7-ab18-9f773d6411a9" xlink:href="usac-20260630.xsd#usac_RevenueFromPartsAndServiceExcludingRevenueFromRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain_019e043a-e449-7f97-98ed-042b9e2557ad" xlink:to="loc_usac_RevenueFromPartsAndServiceExcludingRevenueFromRelatedPartyMember_019e043a-e449-7ef7-ab18-9f773d6411a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_RevenueFromRelatedPartyMember_019e043a-e449-7d53-b176-21c5319db411" xlink:href="usac-20260630.xsd#usac_RevenueFromRelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_usac_ContractWithCustomerContractByTimingOrCustomerTypeDomain_019e043a-e449-7f97-98ed-042b9e2557ad" xlink:to="loc_usac_RevenueFromRelatedPartyMember_019e043a-e449-7d53-b176-21c5319db411" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-715f-aae2-41c7f77e31eb" xlink:to="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRecognitionAbstract_019e043a-e449-7bca-90af-60c7bfffe0c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRecognitionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_RevenueRecognitionAbstract_019e043a-e449-7bca-90af-60c7bfffe0c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e043a-e449-7c1b-9e74-991587db07a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRecognitionAbstract_019e043a-e449-7bca-90af-60c7bfffe0c6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e043a-e449-7c1b-9e74-991587db07a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_019e043a-e449-72d6-934b-460bf215ffcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_019e043a-e449-72d6-934b-460bf215ffcd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_019e043a-e449-799b-8820-48172a43fb6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019e043a-e449-72d6-934b-460bf215ffcd" xlink:to="loc_us-gaap_CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization_019e043a-e449-799b-8820-48172a43fb6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_019e043a-e449-785a-ad6b-e84d25980553" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019e043a-e449-72d6-934b-460bf215ffcd" xlink:to="loc_us-gaap_DepreciationAndAmortization_019e043a-e449-785a-ad6b-e84d25980553" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e043a-e449-7ad4-a9e8-0d3b37d47fdf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019e043a-e449-72d6-934b-460bf215ffcd" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e043a-e449-7ad4-a9e8-0d3b37d47fdf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_019e043a-e449-72d7-8810-b196480ae5d3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019e043a-e449-72d6-934b-460bf215ffcd" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_019e043a-e449-72d7-8810-b196480ae5d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_019e043a-e449-7df1-ad33-ce27af05cf60" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ImpairmentOfLongLivedAssetsHeldForUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019e043a-e449-72d6-934b-460bf215ffcd" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_019e043a-e449-7df1-ad33-ce27af05cf60" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_019e043a-e449-7f73-ae85-191248e73257" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostsAndExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019e043a-e449-72d6-934b-460bf215ffcd" xlink:to="loc_us-gaap_CostsAndExpenses_019e043a-e449-7f73-ae85-191248e73257" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019e043a-e449-7405-8280-c5d3fd4f784b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_OperatingIncomeLoss_019e043a-e449-7405-8280-c5d3fd4f784b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e043a-e449-7ada-989e-77b1f46d510b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e043a-e449-7ada-989e-77b1f46d510b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019e043a-e449-79ed-9dbe-20285da91200" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e043a-e449-7ada-989e-77b1f46d510b" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019e043a-e449-79ed-9dbe-20285da91200" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e043a-e449-7056-b2fb-46a2f9b6c8f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e043a-e449-7ada-989e-77b1f46d510b" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e043a-e449-7056-b2fb-46a2f9b6c8f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019e043a-e449-755d-9772-927577b4734e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e043a-e449-7ada-989e-77b1f46d510b" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019e043a-e449-755d-9772-927577b4734e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_019e043a-e449-79a4-aac6-683d402de1f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NonoperatingIncomeExpenseAbstract_019e043a-e449-7ada-989e-77b1f46d510b" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_019e043a-e449-79a4-aac6-683d402de1f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e043a-e449-7919-8da2-71b60d6ed7ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019e043a-e449-7919-8da2-71b60d6ed7ab" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019e043a-e449-73e9-ae36-c6871da4f538" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019e043a-e449-73e9-ae36-c6871da4f538" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019e043a-e449-7d97-b18f-0580c5d0d78b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_NetIncomeLoss_019e043a-e449-7d97-b18f-0580c5d0d78b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e043a-e449-740d-a885-00b8fd8dfeeb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019e043a-e449-740d-a885-00b8fd8dfeeb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAllocatedToLimitedPartners_019e043a-e449-762d-84f9-a11f6d93fd3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAllocatedToLimitedPartners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_NetIncomeLossAllocatedToLimitedPartners_019e043a-e449-762d-84f9-a11f6d93fd3c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding_019e043a-e449-749d-95fd-9cff54085327" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding_019e043a-e449-749d-95fd-9cff54085327" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted_019e043a-e449-7453-b6b8-6d3bc56900a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_WeightedAverageLimitedPartnershipUnitsOutstandingDiluted_019e043a-e449-7453-b6b8-6d3bc56900a9" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax_019e043a-e449-7247-95a8-e83afaa2d139" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax_019e043a-e449-7247-95a8-e83afaa2d139" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted_019e043a-e449-7002-9fd4-d3d25215d284" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted_019e043a-e449-7002-9fd4-d3d25215d284" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsPerLimitedPartnershipUnitOutstanding_019e043a-e449-728d-98d5-abc7a6656476" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionsPerLimitedPartnershipUnitOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract_019e043a-e449-73f6-83f1-7050ed653d67" xlink:to="loc_us-gaap_DistributionsPerLimitedPartnershipUnitOutstanding_019e043a-e449-728d-98d5-abc7a6656476" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/UnauditedCondensedConsolidatedStatementsofChangesinPartnersCapitalDeficit" xlink:type="simple" xlink:href="usac-20260630.xsd#UnauditedCondensedConsolidatedStatementsofChangesinPartnersCapitalDeficit"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/UnauditedCondensedConsolidatedStatementsofChangesinPartnersCapitalDeficit" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e043a-e449-78b1-b118-073da680c29d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e043a-e449-7c6a-acf9-ed66a38767a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-78b1-b118-073da680c29d" xlink:to="loc_us-gaap_StatementTable_019e043a-e449-7c6a-acf9-ed66a38767a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7a15-a570-9aebe24cd441" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e043a-e449-7c6a-acf9-ed66a38767a4" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7a15-a570-9aebe24cd441" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7a15-a570-9aebe24cd441_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7a15-a570-9aebe24cd441" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7a15-a570-9aebe24cd441_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7767-a973-e8f3b7bb7079" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7a15-a570-9aebe24cd441" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7767-a973-e8f3b7bb7079" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CommonUnitsMember_019e043a-e449-7ba2-a574-824b19a7abba" xlink:href="usac-20260630.xsd#usac_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7767-a973-e8f3b7bb7079" xlink:to="loc_usac_CommonUnitsMember_019e043a-e449-7ba2-a574-824b19a7abba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPartnersCapitalRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-78b1-b118-073da680c29d" xlink:to="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_019e043a-e449-77a0-8c26-aac72a08f923" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnersCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:to="loc_us-gaap_PartnersCapital_019e043a-e449-77a0-8c26-aac72a08f923" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e043a-e449-736b-8ebb-2b0d790dbef3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_019e043a-e449-736b-8ebb-2b0d790dbef3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountDistributions_019e043a-e449-7c9c-afc7-ddc9b4056903" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnersCapitalAccountDistributions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:to="loc_us-gaap_PartnersCapitalAccountDistributions_019e043a-e449-7c9c-afc7-ddc9b4056903" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_019e043a-e449-7e78-a420-2217f7c93fe0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_019e043a-e449-7e78-a420-2217f7c93fe0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019e043a-e449-76f9-bfa5-e2191ca1de89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_019e043a-e449-76f9-bfa5-e2191ca1de89" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountUnitBasedCompensation_019e043a-e449-77d1-9332-1562fcbd3898" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnersCapitalAccountUnitBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:to="loc_us-gaap_PartnersCapitalAccountUnitBasedCompensation_019e043a-e449-77d1-9332-1562fcbd3898" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019efba6-5c9d-7ff1-9ff8-71bc9919d78f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_019efba6-5c9d-7ff1-9ff8-71bc9919d78f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAllocatedToLimitedPartners_019e043a-e449-7ee6-92c2-41e1aa150b3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAllocatedToLimitedPartners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInPartnersCapitalRollForward_019e043a-e449-75de-8279-dc2cd7326c5f" xlink:to="loc_us-gaap_NetIncomeLossAllocatedToLimitedPartners_019e043a-e449-7ee6-92c2-41e1aa150b3f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapital_019e043a-e449-7703-b222-a96c4658d8e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnersCapital"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/UnauditedCondensedConsolidatedStatementsofChangesinPartnersCapitalDeficitParenthetical" xlink:type="simple" xlink:href="usac-20260630.xsd#UnauditedCondensedConsolidatedStatementsofChangesinPartnersCapitalDeficitParenthetical"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/UnauditedCondensedConsolidatedStatementsofChangesinPartnersCapitalDeficitParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e043a-e449-7ce8-8e56-a5116c2d5c6d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e043a-e449-719a-8040-52c257e6811e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7ce8-8e56-a5116c2d5c6d" xlink:to="loc_us-gaap_StatementTable_019e043a-e449-719a-8040-52c257e6811e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7838-9102-c4097452044c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e043a-e449-719a-8040-52c257e6811e" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7838-9102-c4097452044c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7838-9102-c4097452044c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7838-9102-c4097452044c" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7838-9102-c4097452044c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7739-b9f9-512366a60e4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7838-9102-c4097452044c" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7739-b9f9-512366a60e4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CommonUnitsMember_019e043a-e449-7ba4-94cd-74b17f6c13a0" xlink:href="usac-20260630.xsd#usac_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7739-b9f9-512366a60e4d" xlink:to="loc_usac_CommonUnitsMember_019e043a-e449-7ba4-94cd-74b17f6c13a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncentiveDistributionDistributionPerUnit_019e043a-e449-7a64-8f03-0c1ed5c81ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncentiveDistributionDistributionPerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7ce8-8e56-a5116c2d5c6d" xlink:to="loc_us-gaap_IncentiveDistributionDistributionPerUnit_019e043a-e449-7a64-8f03-0c1ed5c81ceb" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/UnauditedCondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="usac-20260630.xsd#UnauditedCondensedConsolidatedStatementsofCashFlows"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/UnauditedCondensedConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019e043a-e449-7f6c-bf26-6430605defbe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:to="loc_us-gaap_StatementTable_019e043a-e449-7f6c-bf26-6430605defbe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7078-ba37-9ee86f3b4286" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019e043a-e449-7f6c-bf26-6430605defbe" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7078-ba37-9ee86f3b4286" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7078-ba37-9ee86f3b4286_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7078-ba37-9ee86f3b4286" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7078-ba37-9ee86f3b4286_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7fa1-82d2-479299e839cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e449-7078-ba37-9ee86f3b4286" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7fa1-82d2-479299e839cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CommonUnitsMember_019e043a-e449-76cb-ba59-3f2fe00ffede" xlink:href="usac-20260630.xsd#usac_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7fa1-82d2-479299e839cd" xlink:to="loc_usac_CommonUnitsMember_019e043a-e449-76cb-ba59-3f2fe00ffede" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_PreferredUnitsMember_019e043a-e449-772e-9859-d2314212e567" xlink:href="usac-20260630.xsd#usac_PreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e449-7fa1-82d2-479299e839cd" xlink:to="loc_usac_PreferredUnitsMember_019e043a-e449-772e-9859-d2314212e567" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019e043a-e449-7ef4-b9a0-3bc488a8d8e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019e043a-e449-7ef4-b9a0-3bc488a8d8e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019e043a-e449-7f5e-8e40-c112dbab0d95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019e043a-e449-7ef4-b9a0-3bc488a8d8e3" xlink:to="loc_us-gaap_ProfitLoss_019e043a-e449-7f5e-8e40-c112dbab0d95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019e043a-e449-7ef4-b9a0-3bc488a8d8e3" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_019e043a-e449-75c9-a6ff-3b99bedaa0dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_DepreciationAndAmortization_019e043a-e449-75c9-a6ff-3b99bedaa0dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_019e043a-e449-728c-9b2b-58e7b8beba06" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_019e043a-e449-728c-9b2b-58e7b8beba06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019e043a-e449-71f5-ad1c-256531ff7613" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfFinancingCostsAndDiscounts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_AmortizationOfFinancingCostsAndDiscounts_019e043a-e449-71f5-ad1c-256531ff7613" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HostingArrangementServiceContractImplementationCostExpenseAmortization_019e043a-e449-7649-b389-a651319f825f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HostingArrangementServiceContractImplementationCostExpenseAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_HostingArrangementServiceContractImplementationCostExpenseAmortization_019e043a-e449-7649-b389-a651319f825f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_019e043a-e449-76e1-8418-1da57e7daf71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_ShareBasedCompensation_019e043a-e449-76e1-8418-1da57e7daf71" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_019e043a-e449-7835-8d4a-8417b4014d6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_019e043a-e449-7835-8d4a-8417b4014d6c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_019e043a-e449-7794-ae48-0921a541fc2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_019e043a-e449-7794-ae48-0921a541fc2e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e043a-e449-7d8c-90a9-d027c7373704" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_019e043a-e449-7d8c-90a9-d027c7373704" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_019e043a-e449-7b27-831b-210ccede2508" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf_019e043a-e449-7b27-831b-210ccede2508" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_019e043a-e449-7bbb-8890-e6c88f7bde67" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_019e043a-e449-7e0c-b6ab-33c56e092c67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_019e043a-e449-7e0c-b6ab-33c56e092c67" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_019e043a-e449-7e7c-8911-71680202654e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_019e043a-e449-7e7c-8911-71680202654e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019e043a-e449-7186-ad55-a9329a58ab44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_019e043a-e449-7186-ad55-a9329a58ab44" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_019e043a-e449-7e4b-af92-c41a51fe7f33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentAssets_019e043a-e449-7e4b-af92-c41a51fe7f33" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019e043a-e449-70c2-a345-03a82c38cfde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccountsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayable_019e043a-e449-70c2-a345-03a82c38cfde" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_019e043a-e449-764b-8453-027e65ef4208" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedLiabilities_019e043a-e449-764b-8453-027e65ef4208" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_019e043a-e449-76d7-b20d-9c61c1977a5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_019e043a-e449-73ca-b576-933f8cf88d47" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_019e043a-e449-76d7-b20d-9c61c1977a5e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e043a-e449-7026-899d-9b70e6beba23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract_019e043a-e449-7ef4-b9a0-3bc488a8d8e3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_019e043a-e449-7026-899d-9b70e6beba23" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_019e043a-e449-7740-bddf-52d572fa2b20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_019e043a-e449-7740-bddf-52d572fa2b20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019e043a-e449-7223-baff-caac95902a31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_019e043a-e449-7740-bddf-52d572fa2b20" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_019e043a-e449-7223-baff-caac95902a31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019e043a-e449-763c-8eed-ad9bc1e28210" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_019e043a-e449-7740-bddf-52d572fa2b20" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019e043a-e449-763c-8eed-ad9bc1e28210" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_019e043a-e449-7ea6-8552-0fdea71098a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_019e043a-e449-7740-bddf-52d572fa2b20" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_019e043a-e449-7ea6-8552-0fdea71098a9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_019e043a-e449-7f51-a37c-fe1499aa43fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromInsuranceSettlementInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_019e043a-e449-7740-bddf-52d572fa2b20" xlink:to="loc_us-gaap_ProceedsFromInsuranceSettlementInvestingActivities_019e043a-e449-7f51-a37c-fe1499aa43fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e043a-e449-7e18-8eea-def8dacfd62f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract_019e043a-e449-7740-bddf-52d572fa2b20" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_019e043a-e449-7e18-8eea-def8dacfd62f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_019e043a-e449-7b83-87e7-c80cfc0e33fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfOtherLongTermDebt_019e043a-e449-7b83-87e7-c80cfc0e33fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_019e043a-e449-7264-9eb7-eaced17e12fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_019e043a-e449-7264-9eb7-eaced17e12fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019e043a-e449-7a3b-a88f-0535041dc5f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_019e043a-e449-7a3b-a88f-0535041dc5f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_019e043a-e449-70d2-9f08-b1dfa780e7f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid_019e043a-e449-70d2-9f08-b1dfa780e7f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfFinancingCosts_019e043a-e449-7beb-abed-cd4982a109ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfFinancingCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:to="loc_us-gaap_PaymentsOfFinancingCosts_019e043a-e449-7beb-abed-cd4982a109ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019e043a-e449-79ad-845b-eea03f121583" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_019e043a-e449-79ad-845b-eea03f121583" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e043a-e449-7eee-a60b-cb7725657876" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperationsAbstract_019e043a-e449-7e69-970f-2e9c5a1479ae" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_019e043a-e449-7eee-a60b-cb7725657876" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019e043a-e449-70c5-92f6-2425ee80d107" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_019e043a-e449-70c5-92f6-2425ee80d107" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e043a-e449-78bd-960a-1bb8bb85a44c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e043a-e449-78bd-960a-1bb8bb85a44c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_019e043a-e449-70a2-bf1a-fbc06a3edd92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_019e043a-e449-799f-9f45-aad4dd194de6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_019e043a-e449-799f-9f45-aad4dd194de6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_019e043a-e449-7493-b575-7be427882e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019e043a-e449-799f-9f45-aad4dd194de6" xlink:to="loc_us-gaap_InterestPaidNet_019e043a-e449-7493-b575-7be427882e2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_019e043a-e449-781f-be7e-6e9ef54ac025" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_019e043a-e449-799f-9f45-aad4dd194de6" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_019e043a-e449-781f-be7e-6e9ef54ac025" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e449-7d81-8b76-5458171b5ce6" xlink:to="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_NoncashOrPartNoncashDistributionsToCommonUnitholders_019e043a-e449-7b2f-97c9-e02ed681c5aa" xlink:href="usac-20260630.xsd#usac_NoncashOrPartNoncashDistributionsToCommonUnitholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:to="loc_usac_NoncashOrPartNoncashDistributionsToCommonUnitholders_019e043a-e449-7b2f-97c9-e02ed681c5aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_TransfersToFromInventoryToPropertyAndEquipment_019e043a-e449-729a-a17b-0d10505a3822" xlink:href="usac-20260630.xsd#usac_TransfersToFromInventoryToPropertyAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:to="loc_usac_TransfersToFromInventoryToPropertyAndEquipment_019e043a-e449-729a-a17b-0d10505a3822" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_IncreaseDecreaseInCapitalExpendituresIncurredButNotYetPaid_019e043a-e449-7c01-9545-31db05e9f483" xlink:href="usac-20260630.xsd#usac_IncreaseDecreaseInCapitalExpendituresIncurredButNotYetPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:to="loc_usac_IncreaseDecreaseInCapitalExpendituresIncurredButNotYetPaid_019e043a-e449-7c01-9545-31db05e9f483" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019efba2-729a-75c4-90fd-251a073a216d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_019efba2-729a-75c4-90fd-251a073a216d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_FinancingCostsIncludedInAccountsPayableAndAccruedLiabilities_019e043a-e449-7cc8-89db-740d1834b544" xlink:href="usac-20260630.xsd#usac_FinancingCostsIncludedInAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:to="loc_usac_FinancingCostsIncludedInAccountsPayableAndAccruedLiabilities_019e043a-e449-7cc8-89db-740d1834b544" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CommonUnitsIssuedAcquisition_019fb3c4-4662-7d6c-b7b0-b8fe78a5463a" xlink:href="usac-20260630.xsd#usac_CommonUnitsIssuedAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:to="loc_usac_CommonUnitsIssuedAcquisition_019fb3c4-4662-7d6c-b7b0-b8fe78a5463a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_ExerciseAndConversionOfPreferredUnits_019efba2-0a3b-740d-860c-52a1142df0bd" xlink:href="usac-20260630.xsd#usac_ExerciseAndConversionOfPreferredUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_019e043a-e449-7df1-9966-5245faca7594" xlink:to="loc_usac_ExerciseAndConversionOfPreferredUnits_019efba2-0a3b-740d-860c-52a1142df0bd" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/OrganizationandDescriptionofBusinessNarrativeDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#OrganizationandDescriptionofBusinessNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/OrganizationandDescriptionofBusinessNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7fa9-af38-0cae34ae5cd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7fa9-af38-0cae34ae5cd4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-7e5e-abdd-d8dfe3a9310b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7fa9-af38-0cae34ae5cd4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-7e5e-abdd-d8dfe3a9310b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-7e5e-abdd-d8dfe3a9310b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-7e5e-abdd-d8dfe3a9310b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-7e5e-abdd-d8dfe3a9310b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-7759-b10a-b0ec89ce58a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-7e5e-abdd-d8dfe3a9310b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-7759-b10a-b0ec89ce58a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_JWPowerCompanyMember_019e043a-e449-71ad-9a74-a88f2baee13d" xlink:href="usac-20260630.xsd#usac_JWPowerCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-7759-b10a-b0ec89ce58a5" xlink:to="loc_usac_JWPowerCompanyMember_019e043a-e449-71ad-9a74-a88f2baee13d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019e043a-e449-7372-b19f-f3eb1a16e259" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7fa9-af38-0cae34ae5cd4" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019e043a-e449-7372-b19f-f3eb1a16e259" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019e043a-e449-7372-b19f-f3eb1a16e259_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019e043a-e449-7372-b19f-f3eb1a16e259" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019e043a-e449-7372-b19f-f3eb1a16e259_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019e043a-e449-734f-afc2-118d48a2d42d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_019e043a-e449-7372-b19f-f3eb1a16e259" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019e043a-e449-734f-afc2-118d48a2d42d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CommonUnitsMember_019e043a-e449-77c2-a909-759757054593" xlink:href="usac-20260630.xsd#usac_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_019e043a-e449-734f-afc2-118d48a2d42d" xlink:to="loc_usac_CommonUnitsMember_019e043a-e449-77c2-a909-759757054593" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_BusinessCombinationConsiderationBeforeAdjustments_019e043a-e449-726f-bba4-9e77f6ac44f0" xlink:href="usac-20260630.xsd#usac_BusinessCombinationConsiderationBeforeAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_usac_BusinessCombinationConsiderationBeforeAdjustments_019e043a-e449-726f-bba4-9e77f6ac44f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019e043a-e449-715c-baa8-17443e96218b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_019e043a-e449-715c-baa8-17443e96218b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019e043a-e449-74b6-bc47-cc5f5efacc8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_019e043a-e449-74b6-bc47-cc5f5efacc8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019e043a-e449-7f3d-be5d-0dc5ed4c4bcd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_019e043a-e449-7f3d-be5d-0dc5ed4c4bcd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_019e043a-e449-7a4a-a092-8c2d5bfd1798" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_019e043a-e449-7a4a-a092-8c2d5bfd1798" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_BusinessCombinationNumberOfActiveHorsepowerAcquired_019e043a-e449-7643-9d8b-d417baa85486" xlink:href="usac-20260630.xsd#usac_BusinessCombinationNumberOfActiveHorsepowerAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_usac_BusinessCombinationNumberOfActiveHorsepowerAcquired_019e043a-e449-7643-9d8b-d417baa85486" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_BusinessCombinationNumberOfTotalHorsepowerAcquired_019e043a-e449-75f4-b19c-0a68b6292f31" xlink:href="usac-20260630.xsd#usac_BusinessCombinationNumberOfTotalHorsepowerAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_usac_BusinessCombinationNumberOfTotalHorsepowerAcquired_019e043a-e449-75f4-b19c-0a68b6292f31" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_019e043a-e449-7de7-b80e-09382be0eda6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_019e043a-e449-7de7-b80e-09382be0eda6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_019e043a-e449-7efa-8d58-7d1223d584ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_019e043a-e449-7efa-8d58-7d1223d584ea" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e043a-e449-7c51-aa1d-10867878c814" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7740-92e6-f026f67fa3a3" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_019e043a-e449-7c51-aa1d-10867878c814" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/OrganizationandDescriptionofBusinessBusinessCombinationDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#OrganizationandDescriptionofBusinessBusinessCombinationDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/OrganizationandDescriptionofBusinessBusinessCombinationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7e01-870e-a8ee51115aff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7e01-870e-a8ee51115aff" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-74d0-a762-8e46a772a7fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7e01-870e-a8ee51115aff" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-74d0-a762-8e46a772a7fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-74d0-a762-8e46a772a7fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-74d0-a762-8e46a772a7fb" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-74d0-a762-8e46a772a7fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-73b1-9b48-72ec38ab6cf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-74d0-a762-8e46a772a7fb" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-73b1-9b48-72ec38ab6cf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_JWPowerCompanyMember_019e043a-e449-7559-9ca5-5cdd11077695" xlink:href="usac-20260630.xsd#usac_JWPowerCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-73b1-9b48-72ec38ab6cf1" xlink:to="loc_usac_JWPowerCompanyMember_019e043a-e449-7559-9ca5-5cdd11077695" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e043a-e449-7138-959c-7f715bfeb103" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7e01-870e-a8ee51115aff" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e043a-e449-7138-959c-7f715bfeb103" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e449-7138-959c-7f715bfeb103_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e043a-e449-7138-959c-7f715bfeb103" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e449-7138-959c-7f715bfeb103_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e449-7995-82c8-59f6f4e3b2d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e043a-e449-7138-959c-7f715bfeb103" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e449-7995-82c8-59f6f4e3b2d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019e043a-e449-7f89-abe4-50d420617f38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e449-7995-82c8-59f6f4e3b2d0" xlink:to="loc_us-gaap_TradeNamesMember_019e043a-e449-7f89-abe4-50d420617f38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_019e043a-e449-7f15-a5e7-cc0c428350d8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets_019e043a-e449-7f15-a5e7-cc0c428350d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019e043a-e449-7ce2-a129-fb528d708c8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_019e043a-e449-7ce2-a129-fb528d708c8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_BusinessCombinationLeaseRightOfUseAssetsNet_019e043a-e449-7bb2-be1a-879aa1d48920" xlink:href="usac-20260630.xsd#usac_BusinessCombinationLeaseRightOfUseAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_usac_BusinessCombinationLeaseRightOfUseAssetsNet_019e043a-e449-7bb2-be1a-879aa1d48920" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019e043a-e449-739e-928a-52f4d0f5b8bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_019e043a-e449-739e-928a-52f4d0f5b8bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019e043a-e449-742b-b2ce-1a3942cbab62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_019e043a-e449-742b-b2ce-1a3942cbab62" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019e043a-e449-77c0-8def-d0a93b2dacb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_Goodwill_019e043a-e449-77c0-8def-d0a93b2dacb4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_BusinessCombinationRecognizedAssetAcquiredAssetsIncludingGoodwill_019e043a-e449-7952-b6f9-889b7f21d2cd" xlink:href="usac-20260630.xsd#usac_BusinessCombinationRecognizedAssetAcquiredAssetsIncludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_usac_BusinessCombinationRecognizedAssetAcquiredAssetsIncludingGoodwill_019e043a-e449-7952-b6f9-889b7f21d2cd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_019e043a-e449-7963-be6b-2572e089a916" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_019e043a-e449-7963-be6b-2572e089a916" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_BusinessCombinationRecognizedLiabilityAssumedOperatingLeaseLiabilitiesNoncurrent_019e043a-e449-73f1-a86d-eb9ffd6e76f7" xlink:href="usac-20260630.xsd#usac_BusinessCombinationRecognizedLiabilityAssumedOperatingLeaseLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_usac_BusinessCombinationRecognizedLiabilityAssumedOperatingLeaseLiabilitiesNoncurrent_019e043a-e449-73f1-a86d-eb9ffd6e76f7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019e043a-e449-7267-b743-2e81a37cf1db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019e043a-e449-7267-b743-2e81a37cf1db" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019e043a-e449-78d3-b566-9b27a12aa542" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_019e043a-e449-78d3-b566-9b27a12aa542" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019e043a-e449-7fc1-8787-5de5b8c41a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_019e043a-e449-7fc1-8787-5de5b8c41a4b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_019e043a-e449-762e-99e3-c00bfb9e7cc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_019e043a-e449-762e-99e3-c00bfb9e7cc6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_BusinessCombinationConsiderationTransferredNetOfCashAcquired_019e043a-e449-7447-a04c-c4626d7ad725" xlink:href="usac-20260630.xsd#usac_BusinessCombinationConsiderationTransferredNetOfCashAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_usac_BusinessCombinationConsiderationTransferredNetOfCashAcquired_019e043a-e449-7447-a04c-c4626d7ad725" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019e043a-e449-7f03-a790-baa417e81152" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019e043a-e449-7f03-a790-baa417e81152" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_019e043a-e449-7b7d-b540-a97c2632e548" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7166-a3e4-27ce73c42f20" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_019e043a-e449-7b7d-b540-a97c2632e548" xlink:type="arc" order="15"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/OrganizationandDescriptionofBusinessBusinessCombinationProformaResultsofOperationsDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#OrganizationandDescriptionofBusinessBusinessCombinationProformaResultsofOperationsDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/OrganizationandDescriptionofBusinessBusinessCombinationProformaResultsofOperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7fc1-b0ec-f69df0784a2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7b70-8202-3dfceb2fe5b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7fc1-b0ec-f69df0784a2b" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7b70-8202-3dfceb2fe5b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-72da-a9ce-d1db93b6d2b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e449-7b70-8202-3dfceb2fe5b1" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-72da-a9ce-d1db93b6d2b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-72da-a9ce-d1db93b6d2b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-72da-a9ce-d1db93b6d2b3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-72da-a9ce-d1db93b6d2b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-70a8-831b-f0086fffc651" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e449-72da-a9ce-d1db93b6d2b3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-70a8-831b-f0086fffc651" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_JWPowerCompanyMember_019e043a-e449-7cd6-8d98-f6f0ec0756bd" xlink:href="usac-20260630.xsd#usac_JWPowerCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e449-70a8-831b-f0086fffc651" xlink:to="loc_usac_JWPowerCompanyMember_019e043a-e449-7cd6-8d98-f6f0ec0756bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019e043a-e449-7930-afb9-43b84ad7c989" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7fc1-b0ec-f69df0784a2b" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_019e043a-e449-7930-afb9-43b84ad7c989" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_019e043a-e449-74c8-a95e-b6a2f7750e85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e449-7fc1-b0ec-f69df0784a2b" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_019e043a-e449-74c8-a95e-b6a2f7750e85" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/BasisofPresentationandSignificantAccountingPoliciesPropertyandEquipmentIntangibleAssetsandGoodwillDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#BasisofPresentationandSignificantAccountingPoliciesPropertyandEquipmentIntangibleAssetsandGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/BasisofPresentationandSignificantAccountingPoliciesPropertyandEquipmentIntangibleAssetsandGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-716b-98b1-22f5213ea591" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e449-76f5-b2c4-733d3738da8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-716b-98b1-22f5213ea591" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e449-76f5-b2c4-733d3738da8e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e449-7d3f-841e-39db942d731f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e449-76f5-b2c4-733d3738da8e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e449-7d3f-841e-39db942d731f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-7d3f-841e-39db942d731f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e449-7d3f-841e-39db942d731f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-7d3f-841e-39db942d731f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-71c7-bb4e-6eed8dcbed07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e449-7d3f-841e-39db942d731f" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-71c7-bb4e-6eed8dcbed07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CompressionEquipmentOverhaulsMember_019e043a-e449-79cc-ac7e-05c7c5711c37" xlink:href="usac-20260630.xsd#usac_CompressionEquipmentOverhaulsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-71c7-bb4e-6eed8dcbed07" xlink:to="loc_usac_CompressionEquipmentOverhaulsMember_019e043a-e449-79cc-ac7e-05c7c5711c37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e043a-e449-77be-8ccd-e315709ee84d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e449-76f5-b2c4-733d3738da8e" xlink:to="loc_srt_RangeAxis_019e043a-e449-77be-8ccd-e315709ee84d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e043a-e449-77be-8ccd-e315709ee84d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e043a-e449-77be-8ccd-e315709ee84d" xlink:to="loc_srt_RangeMember_019e043a-e449-77be-8ccd-e315709ee84d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e043a-e449-7476-95d3-c3095ea6bfb4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e043a-e449-77be-8ccd-e315709ee84d" xlink:to="loc_srt_RangeMember_019e043a-e449-7476-95d3-c3095ea6bfb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e043a-e449-7182-a066-9725cead8004" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e043a-e449-7476-95d3-c3095ea6bfb4" xlink:to="loc_srt_MinimumMember_019e043a-e449-7182-a066-9725cead8004" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e043a-e449-724f-9534-9f1c9024d975" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e043a-e449-7476-95d3-c3095ea6bfb4" xlink:to="loc_srt_MaximumMember_019e043a-e449-724f-9534-9f1c9024d975" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e043a-e449-7749-8b5c-62060ccff672" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-716b-98b1-22f5213ea591" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e043a-e449-7749-8b5c-62060ccff672" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCostsCapitalized_019e043a-e449-7d63-b9e1-38f0fa4d9039" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestCostsCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-716b-98b1-22f5213ea591" xlink:to="loc_us-gaap_InterestCostsCapitalized_019e043a-e449-7d63-b9e1-38f0fa4d9039" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019e043a-e449-743c-a269-bccbf700d3f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-716b-98b1-22f5213ea591" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_019e043a-e449-743c-a269-bccbf700d3f6" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/BasisofPresentationandSignificantAccountingPoliciesFairValueofSeniorNotesDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#BasisofPresentationandSignificantAccountingPoliciesFairValueofSeniorNotesDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/BasisofPresentationandSignificantAccountingPoliciesFairValueofSeniorNotesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e043a-e449-741e-a04c-25dcc26a6b02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e043a-e449-71ce-a4ec-f95825855f72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e043a-e449-741e-a04c-25dcc26a6b02" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e043a-e449-71ce-a4ec-f95825855f72" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e043a-e449-7924-ad00-d1e4543356a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019e043a-e449-71ce-a4ec-f95825855f72" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e043a-e449-7924-ad00-d1e4543356a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e449-7924-ad00-d1e4543356a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e043a-e449-7924-ad00-d1e4543356a6" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e449-7924-ad00-d1e4543356a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e449-7012-a0d2-9f6343b43a79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e043a-e449-7924-ad00-d1e4543356a6" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e449-7012-a0d2-9f6343b43a79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_SeniorNotesDueIn2029Member_019e043a-e449-7ed0-b5f4-caac02c0ff98" xlink:href="usac-20260630.xsd#usac_SeniorNotesDueIn2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e449-7012-a0d2-9f6343b43a79" xlink:to="loc_usac_SeniorNotesDueIn2029Member_019e043a-e449-7ed0-b5f4-caac02c0ff98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_SeniorNotesDue2033Member_019e043a-e449-7e07-9e6a-374c631b2c04" xlink:href="usac-20260630.xsd#usac_SeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e449-7012-a0d2-9f6343b43a79" xlink:to="loc_usac_SeniorNotesDue2033Member_019e043a-e449-7e07-9e6a-374c631b2c04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019e043a-e449-7aec-bb3c-a5fa716135de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e043a-e449-741e-a04c-25dcc26a6b02" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019e043a-e449-7aec-bb3c-a5fa716135de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019e043a-e449-71b4-81c2-2913f089cd20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019e043a-e449-741e-a04c-25dcc26a6b02" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019e043a-e449-71b4-81c2-2913f089cd20" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/PropertyandEquipmentandIdentifiableIntangibleAssetsSummaryofPropertyandEquipmentDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#PropertyandEquipmentandIdentifiableIntangibleAssetsSummaryofPropertyandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/PropertyandEquipmentandIdentifiableIntangibleAssetsSummaryofPropertyandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-77c4-aafb-88877c448a20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e449-7940-8474-8ffc478fd9b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-77c4-aafb-88877c448a20" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e449-7940-8474-8ffc478fd9b3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e449-73b4-a597-ffce4a079b1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e449-7940-8474-8ffc478fd9b3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e449-73b4-a597-ffce4a079b1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-73b4-a597-ffce4a079b1b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e449-73b4-a597-ffce4a079b1b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-73b4-a597-ffce4a079b1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e449-73b4-a597-ffce4a079b1b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GasGatheringAndProcessingEquipmentMember_019e043a-e449-752b-84f4-db9537173310" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GasGatheringAndProcessingEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:to="loc_us-gaap_GasGatheringAndProcessingEquipmentMember_019e043a-e449-752b-84f4-db9537173310" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_019e043a-e449-7b98-b4f3-9fc9c81b3255" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:to="loc_us-gaap_VehiclesMember_019e043a-e449-7b98-b4f3-9fc9c81b3255" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_019e043a-e449-762e-a028-0068b6ef6b63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:to="loc_us-gaap_ComputerEquipmentMember_019e043a-e449-762e-a028-0068b6ef6b63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_019e043a-e449-7e04-824f-3526b88599b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_019e043a-e449-7e04-824f-3526b88599b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_019e043a-e449-74ac-921d-a00b90354027" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:to="loc_us-gaap_BuildingMember_019e043a-e449-74ac-921d-a00b90354027" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_019e043a-e449-7c2e-ae52-1e2458a54fd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_019e043a-e449-7c2e-ae52-1e2458a54fd8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_019e043a-e449-7391-9bd9-0a3bb0894f75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:to="loc_us-gaap_LandMember_019e043a-e449-7391-9bd9-0a3bb0894f75" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CompressionEquipmentMember_019e043a-e449-7ec2-b98c-0b9b76dd5767" xlink:href="usac-20260630.xsd#usac_CompressionEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e449-791b-8008-43a79c16bbd8" xlink:to="loc_usac_CompressionEquipmentMember_019e043a-e449-7ec2-b98c-0b9b76dd5767" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e043a-e449-7c51-a270-2fcdf4c65b6a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e449-7940-8474-8ffc478fd9b3" xlink:to="loc_srt_RangeAxis_019e043a-e449-7c51-a270-2fcdf4c65b6a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e043a-e449-7c51-a270-2fcdf4c65b6a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e043a-e449-7c51-a270-2fcdf4c65b6a" xlink:to="loc_srt_RangeMember_019e043a-e449-7c51-a270-2fcdf4c65b6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e043a-e449-7ac4-a119-e7e9b893ba61" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e043a-e449-7c51-a270-2fcdf4c65b6a" xlink:to="loc_srt_RangeMember_019e043a-e449-7ac4-a119-e7e9b893ba61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e043a-e449-727b-a4ae-d91356e205a1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e043a-e449-7ac4-a119-e7e9b893ba61" xlink:to="loc_srt_MinimumMember_019e043a-e449-727b-a4ae-d91356e205a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e043a-e449-730b-9ba2-72f231f42329" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e043a-e449-7ac4-a119-e7e9b893ba61" xlink:to="loc_srt_MaximumMember_019e043a-e449-730b-9ba2-72f231f42329" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019e043a-e449-7b8a-89ce-0e6bb114a5d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-77c4-aafb-88877c448a20" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_019e043a-e449-7b8a-89ce-0e6bb114a5d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019e043a-e449-7d65-b9c5-dd56631fd19d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-77c4-aafb-88877c448a20" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_019e043a-e449-7d65-b9c5-dd56631fd19d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e043a-e52b-7bd9-b35f-2e2760be0496" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-77c4-aafb-88877c448a20" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_019e043a-e52b-7bd9-b35f-2e2760be0496" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_ReclassificationOfSerializedInventoryToFixedAssets_019e043a-e52b-7635-8325-b41e5b7d4d46" xlink:href="usac-20260630.xsd#usac_ReclassificationOfSerializedInventoryToFixedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-77c4-aafb-88877c448a20" xlink:to="loc_usac_ReclassificationOfSerializedInventoryToFixedAssets_019e043a-e52b-7635-8325-b41e5b7d4d46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e043a-e52b-780c-8f1a-2bef052c6701" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e449-77c4-aafb-88877c448a20" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e043a-e52b-780c-8f1a-2bef052c6701" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/PropertyandEquipmentandIdentifiableIntangibleAssetsPropertyPlantandEquipmentUsefulLivesDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#PropertyandEquipmentandIdentifiableIntangibleAssetsPropertyPlantandEquipmentUsefulLivesDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/PropertyandEquipmentandIdentifiableIntangibleAssetsPropertyPlantandEquipmentUsefulLivesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-7f0e-b011-9867ffffa663" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e52b-7584-b5a0-23c6130af5cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-7f0e-b011-9867ffffa663" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e52b-7584-b5a0-23c6130af5cc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e043a-e52b-774d-a433-13cd089ecebf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e52b-7584-b5a0-23c6130af5cc" xlink:to="loc_srt_RangeAxis_019e043a-e52b-774d-a433-13cd089ecebf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e043a-e52b-774d-a433-13cd089ecebf_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e043a-e52b-774d-a433-13cd089ecebf" xlink:to="loc_srt_RangeMember_019e043a-e52b-774d-a433-13cd089ecebf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e043a-e52b-7b4f-b94f-1bf51df94266" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e043a-e52b-774d-a433-13cd089ecebf" xlink:to="loc_srt_RangeMember_019e043a-e52b-7b4f-b94f-1bf51df94266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e043a-e52b-7f5e-91fb-36657d24a603" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e043a-e52b-7b4f-b94f-1bf51df94266" xlink:to="loc_srt_MinimumMember_019e043a-e52b-7f5e-91fb-36657d24a603" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e043a-e52b-75ac-8d09-6b59bff7e03d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e043a-e52b-7b4f-b94f-1bf51df94266" xlink:to="loc_srt_MaximumMember_019e043a-e52b-75ac-8d09-6b59bff7e03d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e52b-77b9-9568-823dcb4e3884" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e52b-7584-b5a0-23c6130af5cc" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e52b-77b9-9568-823dcb4e3884" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-77b9-9568-823dcb4e3884_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e52b-77b9-9568-823dcb4e3884" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-77b9-9568-823dcb4e3884_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7bd7-85e8-5f58e566a05b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e52b-77b9-9568-823dcb4e3884" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7bd7-85e8-5f58e566a05b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_NewlyAcquiredCompressionEquipmentMember_019e043a-e52b-7bcf-8077-1861fe5f18f1" xlink:href="usac-20260630.xsd#usac_NewlyAcquiredCompressionEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7bd7-85e8-5f58e566a05b" xlink:to="loc_usac_NewlyAcquiredCompressionEquipmentMember_019e043a-e52b-7bcf-8077-1861fe5f18f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_UsedCompressionEquipmentMember_019e043a-e52b-790e-9ec6-96e55ec8772f" xlink:href="usac-20260630.xsd#usac_UsedCompressionEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7bd7-85e8-5f58e566a05b" xlink:to="loc_usac_UsedCompressionEquipmentMember_019e043a-e52b-790e-9ec6-96e55ec8772f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_019e043a-e52b-7e60-ae41-8910f1da9b46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7bd7-85e8-5f58e566a05b" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_019e043a-e52b-7e60-ae41-8910f1da9b46" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_VehiclesAndComputerEquipmentMember_019e043a-e52b-722d-8d96-a24de8f4e4b6" xlink:href="usac-20260630.xsd#usac_VehiclesAndComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7bd7-85e8-5f58e566a05b" xlink:to="loc_usac_VehiclesAndComputerEquipmentMember_019e043a-e52b-722d-8d96-a24de8f4e4b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_019e043a-e52b-78c3-b8f1-0f88a36346e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7bd7-85e8-5f58e566a05b" xlink:to="loc_us-gaap_BuildingMember_019e043a-e52b-78c3-b8f1-0f88a36346e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_019e043a-e52b-7fcc-95d5-36f9b65f46e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7bd7-85e8-5f58e566a05b" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_019e043a-e52b-7fcc-95d5-36f9b65f46e7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e043a-e52b-74cf-836d-103b0c00e04c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-7f0e-b011-9867ffffa663" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_019e043a-e52b-74cf-836d-103b0c00e04c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/PropertyandEquipmentandIdentifiableIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#PropertyandEquipmentandIdentifiableIntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/PropertyandEquipmentandIdentifiableIntangibleAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-78f2-acd0-1dcd85db50cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e52b-76af-a198-123226532d43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-78f2-acd0-1dcd85db50cc" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e52b-76af-a198-123226532d43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e52b-785c-a5c9-b0db0933f30e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_019e043a-e52b-76af-a198-123226532d43" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e52b-785c-a5c9-b0db0933f30e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-785c-a5c9-b0db0933f30e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e52b-785c-a5c9-b0db0933f30e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-785c-a5c9-b0db0933f30e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7fca-a5d4-83027b3ee894" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019e043a-e52b-785c-a5c9-b0db0933f30e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7fca-a5d4-83027b3ee894" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CompressionEquipmentMember_019e043a-e52b-77e0-971d-1642dc08d5bb" xlink:href="usac-20260630.xsd#usac_CompressionEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019e043a-e52b-7fca-a5d4-83027b3ee894" xlink:to="loc_usac_CompressionEquipmentMember_019e043a-e52b-77e0-971d-1642dc08d5bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_NumberOfCompressorUnitsThatAreToBeRetiredOrSoldOrReutilized_019e043a-e52b-720a-ae27-99f578095f8f" xlink:href="usac-20260630.xsd#usac_NumberOfCompressorUnitsThatAreToBeRetiredOrSoldOrReutilized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-78f2-acd0-1dcd85db50cc" xlink:to="loc_usac_NumberOfCompressorUnitsThatAreToBeRetiredOrSoldOrReutilized_019e043a-e52b-720a-ae27-99f578095f8f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_NumberOfHorsepowerUnitsThatAreToBeRetiredOrSoldOrReutilized_019e043a-e52b-7cc5-a0e8-1bc084199bb5" xlink:href="usac-20260630.xsd#usac_NumberOfHorsepowerUnitsThatAreToBeRetiredOrSoldOrReutilized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-78f2-acd0-1dcd85db50cc" xlink:to="loc_usac_NumberOfHorsepowerUnitsThatAreToBeRetiredOrSoldOrReutilized_019e043a-e52b-7cc5-a0e8-1bc084199bb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_019e043a-e52b-7dec-a54d-c3333a14bb84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ImpairmentOfLongLivedAssetsHeldForUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-78f2-acd0-1dcd85db50cc" xlink:to="loc_us-gaap_ImpairmentOfLongLivedAssetsHeldForUse_019e043a-e52b-7dec-a54d-c3333a14bb84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e043a-e52b-72d8-8134-de2d4ae84f2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_019e043a-e52b-78f2-acd0-1dcd85db50cc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019e043a-e52b-72d8-8134-de2d4ae84f2b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/PropertyandEquipmentandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#PropertyandEquipmentandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/PropertyandEquipmentandIdentifiableIntangibleAssetsIdentifiableIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e043a-e52b-7a20-9499-4cfd82412d37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e043a-e52b-7ffb-9249-de09d9ece78f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e043a-e52b-7a20-9499-4cfd82412d37" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e043a-e52b-7ffb-9249-de09d9ece78f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e043a-e52b-7469-8c79-6d01cd2eb07e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019e043a-e52b-7ffb-9249-de09d9ece78f" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e043a-e52b-7469-8c79-6d01cd2eb07e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e52b-7469-8c79-6d01cd2eb07e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e043a-e52b-7469-8c79-6d01cd2eb07e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e52b-7469-8c79-6d01cd2eb07e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e52b-7f1e-b616-111168d11093" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019e043a-e52b-7469-8c79-6d01cd2eb07e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e52b-7f1e-b616-111168d11093" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019e043a-e52b-7297-b4ad-af7c0f1da369" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e52b-7f1e-b616-111168d11093" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019e043a-e52b-7297-b4ad-af7c0f1da369" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019e043a-e52b-79a0-bc9f-766d3ed19e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019e043a-e52b-7f1e-b616-111168d11093" xlink:to="loc_us-gaap_TradeNamesMember_019e043a-e52b-79a0-bc9f-766d3ed19e6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019e043a-e52b-71de-a23c-7b28f78d1266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019e043a-e52b-7a20-9499-4cfd82412d37" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019e043a-e52b-71de-a23c-7b28f78d1266" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e043a-e52b-78a8-9281-0168d927aeb8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019e043a-e52b-71de-a23c-7b28f78d1266" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e043a-e52b-78a8-9281-0168d927aeb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_019e043a-e52b-7ebf-be1e-4f828b7ffea3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019e043a-e52b-71de-a23c-7b28f78d1266" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_019e043a-e52b-7ebf-be1e-4f828b7ffea3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019e043a-e52b-7d06-a8f3-01f8774d55e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019e043a-e52b-71de-a23c-7b28f78d1266" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019e043a-e52b-7d06-a8f3-01f8774d55e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019e043a-e52b-7d95-8a1c-e61927397338" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/IncomeTaxExpenseDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#IncomeTaxExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/IncomeTaxExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e52b-7434-936f-37f361b5910a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e52b-71c3-a76b-03ccba2e6ca9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e52b-7434-936f-37f361b5910a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e52b-71c3-a76b-03ccba2e6ca9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e52b-7bbb-9365-c73f3a8b18fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_019e043a-e52b-71c3-a76b-03ccba2e6ca9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e52b-7bbb-9365-c73f3a8b18fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e52b-7bbb-9365-c73f3a8b18fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e52b-7bbb-9365-c73f3a8b18fc" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e52b-7bbb-9365-c73f3a8b18fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e52b-7a98-96b3-03eb44080224" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019e043a-e52b-7bbb-9365-c73f3a8b18fc" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e52b-7a98-96b3-03eb44080224" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_JWPowerCompanyMember_019e043a-e52b-7cb2-b915-d53be90fd06d" xlink:href="usac-20260630.xsd#usac_JWPowerCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019e043a-e52b-7a98-96b3-03eb44080224" xlink:to="loc_usac_JWPowerCompanyMember_019e043a-e52b-7cb2-b915-d53be90fd06d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019fbfa2-3b98-78a7-85ae-ac7a473d6f6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_019e043a-e52b-7434-936f-37f361b5910a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_019fbfa2-3b98-78a7-85ae-ac7a473d6f6c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/DebtObligationSummaryofDebtDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#DebtObligationSummaryofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/DebtObligationSummaryofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7dc2-9f87-1ddb835261e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d16-8138-e73dda975e47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7dc2-9f87-1ddb835261e9" xlink:to="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d16-8138-e73dda975e47" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e043a-e52b-786b-8a72-abb5c5c37e31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d16-8138-e73dda975e47" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e043a-e52b-786b-8a72-abb5c5c37e31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-786b-8a72-abb5c5c37e31_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e043a-e52b-786b-8a72-abb5c5c37e31" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-786b-8a72-abb5c5c37e31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-7a39-b163-0a7b541e2bd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e043a-e52b-786b-8a72-abb5c5c37e31" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-7a39-b163-0a7b541e2bd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_SeniorNotesDueIn2029Member_019e043a-e52b-7619-b127-ed80fda40ec9" xlink:href="usac-20260630.xsd#usac_SeniorNotesDueIn2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-7a39-b163-0a7b541e2bd7" xlink:to="loc_usac_SeniorNotesDueIn2029Member_019e043a-e52b-7619-b127-ed80fda40ec9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_SeniorNotesDue2033Member_019e043a-e52b-73c2-9f84-1158ecb42aa4" xlink:href="usac-20260630.xsd#usac_SeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-7a39-b163-0a7b541e2bd7" xlink:to="loc_usac_SeniorNotesDue2033Member_019e043a-e52b-73c2-9f84-1158ecb42aa4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019e043a-e52b-71eb-b89a-c5f68d9232d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-7a39-b163-0a7b541e2bd7" xlink:to="loc_us-gaap_SeniorNotesMember_019e043a-e52b-71eb-b89a-c5f68d9232d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e043a-e52b-7e55-892e-5e7cace360bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d16-8138-e73dda975e47" xlink:to="loc_us-gaap_CreditFacilityAxis_019e043a-e52b-7e55-892e-5e7cace360bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7e55-892e-5e7cace360bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e043a-e52b-7e55-892e-5e7cace360bd" xlink:to="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7e55-892e-5e7cace360bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7e64-a755-362be51116c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e043a-e52b-7e55-892e-5e7cace360bd" xlink:to="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7e64-a755-362be51116c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e043a-e52b-7b9d-959c-4b50bacb484f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7e64-a755-362be51116c8" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e043a-e52b-7b9d-959c-4b50bacb484f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_019fbf8d-bbf5-74e4-b8f3-7ffe907a4b33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7dc2-9f87-1ddb835261e9" xlink:to="loc_us-gaap_LongTermDebtCurrent_019fbf8d-bbf5-74e4-b8f3-7ffe907a4b33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_019e043a-e52b-7415-bc33-96cbc1839b32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7dc2-9f87-1ddb835261e9" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_019e043a-e52b-7415-bc33-96cbc1839b32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019e043a-e52b-73ba-aeb5-6352ab80a7ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7dc2-9f87-1ddb835261e9" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019e043a-e52b-73ba-aeb5-6352ab80a7ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019e043a-e52b-7c34-848e-8f3cfdd129c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7dc2-9f87-1ddb835261e9" xlink:to="loc_us-gaap_LongTermDebt_019e043a-e52b-7c34-848e-8f3cfdd129c7" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/DebtObligationNarrativeDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#DebtObligationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/DebtObligationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d94-aee5-ae7407c940cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d94-aee5-ae7407c940cf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019e043a-e52b-7d6d-af21-73f2a4b8e857" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d94-aee5-ae7407c940cf" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019e043a-e52b-7d6d-af21-73f2a4b8e857" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e52b-7d6d-af21-73f2a4b8e857_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e043a-e52b-7d6d-af21-73f2a4b8e857" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e52b-7d6d-af21-73f2a4b8e857_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e52b-7c70-bfce-c3302a4ede87" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019e043a-e52b-7d6d-af21-73f2a4b8e857" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e52b-7c70-bfce-c3302a4ede87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019e043a-e52b-7999-a3c6-7a9f2284a891" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e52b-7c70-bfce-c3302a4ede87" xlink:to="loc_us-gaap_LineOfCreditMember_019e043a-e52b-7999-a3c6-7a9f2284a891" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019e043a-e52b-770a-8020-95bba101cc7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019e043a-e52b-7c70-bfce-c3302a4ede87" xlink:to="loc_us-gaap_SeniorNotesMember_019e043a-e52b-770a-8020-95bba101cc7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019e043a-e52b-7467-8498-39e1c23a67f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d94-aee5-ae7407c940cf" xlink:to="loc_us-gaap_CreditFacilityAxis_019e043a-e52b-7467-8498-39e1c23a67f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7467-8498-39e1c23a67f7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019e043a-e52b-7467-8498-39e1c23a67f7" xlink:to="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7467-8498-39e1c23a67f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7095-96c9-e8ef3b6da597" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019e043a-e52b-7467-8498-39e1c23a67f7" xlink:to="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7095-96c9-e8ef3b6da597" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019e043a-e52b-7ae1-b0fb-6b35f0657c38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019e043a-e52b-7095-96c9-e8ef3b6da597" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019e043a-e52b-7ae1-b0fb-6b35f0657c38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019e043a-e52b-7866-91a7-c964412ed470" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d94-aee5-ae7407c940cf" xlink:to="loc_us-gaap_DebtInstrumentAxis_019e043a-e52b-7866-91a7-c964412ed470" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-7866-91a7-c964412ed470_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e043a-e52b-7866-91a7-c964412ed470" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-7866-91a7-c964412ed470_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-701e-b46f-ab853f9e51ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019e043a-e52b-7866-91a7-c964412ed470" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-701e-b46f-ab853f9e51ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_SeniorNotesDueIn2029Member_019e043a-e52b-7230-be9d-ca26e080bea0" xlink:href="usac-20260630.xsd#usac_SeniorNotesDueIn2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-701e-b46f-ab853f9e51ca" xlink:to="loc_usac_SeniorNotesDueIn2029Member_019e043a-e52b-7230-be9d-ca26e080bea0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_SeniorNotesDue2033Member_019e043a-e52b-7173-9587-b87f22e5aef1" xlink:href="usac-20260630.xsd#usac_SeniorNotesDue2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019e043a-e52b-701e-b46f-ab853f9e51ca" xlink:to="loc_usac_SeniorNotesDue2033Member_019e043a-e52b-7173-9587-b87f22e5aef1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019e043a-e52b-7d7c-835f-57129adcd136" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d94-aee5-ae7407c940cf" xlink:to="loc_srt_RangeAxis_019e043a-e52b-7d7c-835f-57129adcd136" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e043a-e52b-7d7c-835f-57129adcd136_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019e043a-e52b-7d7c-835f-57129adcd136" xlink:to="loc_srt_RangeMember_019e043a-e52b-7d7c-835f-57129adcd136_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019e043a-e52b-7e02-a316-176e18afa145" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019e043a-e52b-7d7c-835f-57129adcd136" xlink:to="loc_srt_RangeMember_019e043a-e52b-7e02-a316-176e18afa145" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019e043a-e52b-7592-94f9-7bd947796e87" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e043a-e52b-7e02-a316-176e18afa145" xlink:to="loc_srt_MinimumMember_019e043a-e52b-7592-94f9-7bd947796e87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019e043a-e52b-7eca-8e01-0dbb3e7008ab" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019e043a-e52b-7e02-a316-176e18afa145" xlink:to="loc_srt_MaximumMember_019e043a-e52b-7eca-8e01-0dbb3e7008ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_019e043a-e52b-7d97-ab96-523577d363f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019e043a-e52b-7d94-aee5-ae7407c940cf" xlink:to="loc_us-gaap_VariableRateAxis_019e043a-e52b-7d97-ab96-523577d363f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e043a-e52b-7d97-ab96-523577d363f4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_019e043a-e52b-7d97-ab96-523577d363f4" xlink:to="loc_us-gaap_VariableRateDomain_019e043a-e52b-7d97-ab96-523577d363f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_019e043a-e52b-7083-b09e-86254f833283" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_019e043a-e52b-7d97-ab96-523577d363f4" xlink:to="loc_us-gaap_VariableRateDomain_019e043a-e52b-7083-b09e-86254f833283" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_019e043a-e52b-7171-be79-6dead402106d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e043a-e52b-7083-b09e-86254f833283" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_019e043a-e52b-7171-be79-6dead402106d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e043a-e52b-7925-9099-772f36930485" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredOvernightFinancingRateSofrMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e043a-e52b-7083-b09e-86254f833283" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrMember_019e043a-e52b-7925-9099-772f36930485" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_019e043a-e52b-7d86-9bf1-706600cf3abc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_019e043a-e52b-7083-b09e-86254f833283" xlink:to="loc_us-gaap_BaseRateMember_019e043a-e52b-7d86-9bf1-706600cf3abc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_LineOfCreditFacilityConditionTwoMaturityTriggerSeniorNotesOutstandingAmount_019e043a-e52b-7592-bbea-0bb9cea3d781" xlink:href="usac-20260630.xsd#usac_LineOfCreditFacilityConditionTwoMaturityTriggerSeniorNotesOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_usac_LineOfCreditFacilityConditionTwoMaturityTriggerSeniorNotesOutstandingAmount_019e043a-e52b-7592-bbea-0bb9cea3d781" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e043a-e52b-7f75-b0fb-3f266d999799" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019e043a-e52b-7f75-b0fb-3f266d999799" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_LineOfCreditFacilityAccordionFeatureMaximumIncreaseAmount_019e043a-e52b-7a2a-9c2c-fe7d4825399c" xlink:href="usac-20260630.xsd#usac_LineOfCreditFacilityAccordionFeatureMaximumIncreaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_usac_LineOfCreditFacilityAccordionFeatureMaximumIncreaseAmount_019e043a-e52b-7a2a-9c2c-fe7d4825399c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e043a-e52b-7f7e-9032-ff27a341f4d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_019e043a-e52b-7f7e-9032-ff27a341f4d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019e043a-e52b-7e49-8902-c64caebc66cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_019e043a-e52b-7e49-8902-c64caebc66cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_LineOfCreditFacilityCapacityAvailableForRepaymentOfDebt_019e043a-e52b-709d-b15a-71f9e144d493" xlink:href="usac-20260630.xsd#usac_LineOfCreditFacilityCapacityAvailableForRepaymentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_usac_LineOfCreditFacilityCapacityAvailableForRepaymentOfDebt_019e043a-e52b-709d-b15a-71f9e144d493" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_DebtInstrumentCovenantMinimumEBITDAToInterestCoverageRatio_019e043a-e52b-7c3a-b0b9-fb302edd441b" xlink:href="usac-20260630.xsd#usac_DebtInstrumentCovenantMinimumEBITDAToInterestCoverageRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_usac_DebtInstrumentCovenantMinimumEBITDAToInterestCoverageRatio_019e043a-e52b-7c3a-b0b9-fb302edd441b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_DebtInstrumentSecuredIndebtednessToEBITDARatio_019e043a-e52b-7b1d-9e67-fc9998a13f8b" xlink:href="usac-20260630.xsd#usac_DebtInstrumentSecuredIndebtednessToEBITDARatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_usac_DebtInstrumentSecuredIndebtednessToEBITDARatio_019e043a-e52b-7b1d-9e67-fc9998a13f8b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_DebtInstrumentCovenantMaximumFundedDebtToEBITDARatio_019e043a-e52b-721a-a495-0e8ed81befb4" xlink:href="usac-20260630.xsd#usac_DebtInstrumentCovenantMaximumFundedDebtToEBITDARatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_usac_DebtInstrumentCovenantMaximumFundedDebtToEBITDARatio_019e043a-e52b-721a-a495-0e8ed81befb4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_DebtInstrumentCovenantTotalLeverageRatioFundedDebtToEBITDARatio_019e043a-e52b-7d79-95ab-45c506e60a6f" xlink:href="usac-20260630.xsd#usac_DebtInstrumentCovenantTotalLeverageRatioFundedDebtToEBITDARatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_usac_DebtInstrumentCovenantTotalLeverageRatioFundedDebtToEBITDARatio_019e043a-e52b-7d79-95ab-45c506e60a6f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_DebtInstrumentUnusedBorrowingCapacityThreshold_019e043a-e52b-7115-9890-cb67b8b43acb" xlink:href="usac-20260630.xsd#usac_DebtInstrumentUnusedBorrowingCapacityThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_usac_DebtInstrumentUnusedBorrowingCapacityThreshold_019e043a-e52b-7115-9890-cb67b8b43acb" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019e043a-e52b-7e0d-a53a-2f3570395cab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDebtIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_PaymentsOfDebtIssuanceCosts_019e043a-e52b-7e0d-a53a-2f3570395cab" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_019e043a-e52b-7bf2-ba04-8b31f3d21a1c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_019e043a-e52b-7bf2-ba04-8b31f3d21a1c" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_019e043a-e52b-73d5-aa19-0f55373db232" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_019e043a-e52b-73d5-aa19-0f55373db232" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019e043a-e52b-72b4-9111-42b3368a8e2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_019e043a-e52b-72b4-9111-42b3368a8e2b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtWeightedAverageInterestRateOverTime_019e043a-e52b-7911-a25b-8081d1056bf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtWeightedAverageInterestRateOverTime"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_LongTermDebtWeightedAverageInterestRateOverTime_019e043a-e52b-7911-a25b-8081d1056bf8" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e043a-e52b-7b40-9e50-5120c1b8ceef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateEffectivePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateEffectivePercentage_019e043a-e52b-7b40-9e50-5120c1b8ceef" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019e043a-e52b-77a5-8fbf-cc58a2a16d04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_019e043a-e52b-77a5-8fbf-cc58a2a16d04" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019e043a-e52b-7281-938e-3851683584e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019e043a-e52b-7281-938e-3851683584e0" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e043a-e52b-7ab0-b7f9-a96b28843563" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019e043a-e52b-7d06-b73e-58e034e395e2" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019e043a-e52b-7ab0-b7f9-a96b28843563" xlink:type="arc" order="19"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/PreferredUnitsNarrativeDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#PreferredUnitsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/PreferredUnitsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019e043a-e52b-7168-af19-063c4f8a1dd1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_019e043a-e52b-7331-892e-1b623334e879" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e52b-7168-af19-063c4f8a1dd1" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_019e043a-e52b-7331-892e-1b623334e879" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-780a-a64e-27fad13f3952" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_019e043a-e52b-7331-892e-1b623334e879" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-780a-a64e-27fad13f3952" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-780a-a64e-27fad13f3952_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-780a-a64e-27fad13f3952" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-780a-a64e-27fad13f3952_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7937-bd54-eca90493c347" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-780a-a64e-27fad13f3952" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7937-bd54-eca90493c347" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_SeriesPerpetualPreferredUnitsMember_019e043a-e52b-77ed-a0e6-5accde7e6d27" xlink:href="usac-20260630.xsd#usac_SeriesPerpetualPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7937-bd54-eca90493c347" xlink:to="loc_usac_SeriesPerpetualPreferredUnitsMember_019e043a-e52b-77ed-a0e6-5accde7e6d27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_019e043a-e52b-703e-8ecc-b20b5d44e801" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TemporaryEquityParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e52b-7168-af19-063c4f8a1dd1" xlink:to="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_019e043a-e52b-703e-8ecc-b20b5d44e801" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_TemporaryEquityDistributionAmountPerShare_019e043a-e52b-7187-8b2e-3aefa39c44f7" xlink:href="usac-20260630.xsd#usac_TemporaryEquityDistributionAmountPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019e043a-e52b-7168-af19-063c4f8a1dd1" xlink:to="loc_usac_TemporaryEquityDistributionAmountPerShare_019e043a-e52b-7187-8b2e-3aefa39c44f7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/PartnersCapitalDeficitNarrativeDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#PartnersCapitalDeficitNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/PartnersCapitalDeficitNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7b17-9bca-790a904fcf86" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalUnitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f3c-8b38-b64e77381db0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfCapitalUnitsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7b17-9bca-790a904fcf86" xlink:to="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f3c-8b38-b64e77381db0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_019e043a-e52b-7c15-8696-b1feb4b603e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f3c-8b38-b64e77381db0" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_019e043a-e52b-7c15-8696-b1feb4b603e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7c15-8696-b1feb4b603e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_019e043a-e52b-7c15-8696-b1feb4b603e9" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7c15-8696-b1feb4b603e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7271-9695-b4e0a996f89f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_019e043a-e52b-7c15-8696-b1feb4b603e9" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7271-9695-b4e0a996f89f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnerMember_019e043a-e52b-7cd1-a132-e69a03c8bd5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7271-9695-b4e0a996f89f" xlink:to="loc_us-gaap_LimitedPartnerMember_019e043a-e52b-7cd1-a132-e69a03c8bd5e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralPartnerMember_019e043a-e52b-7bdb-85d1-ed0039e524e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7271-9695-b4e0a996f89f" xlink:to="loc_us-gaap_GeneralPartnerMember_019e043a-e52b-7bdb-85d1-ed0039e524e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-7a95-9da9-82719f5a2810" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f3c-8b38-b64e77381db0" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-7a95-9da9-82719f5a2810" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7a95-9da9-82719f5a2810_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-7a95-9da9-82719f5a2810" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7a95-9da9-82719f5a2810_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7744-a469-f3853b371e5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-7a95-9da9-82719f5a2810" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7744-a469-f3853b371e5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CommonUnitsMember_019e043a-e52b-7a61-a903-9f19759a93dd" xlink:href="usac-20260630.xsd#usac_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7744-a469-f3853b371e5c" xlink:to="loc_usac_CommonUnitsMember_019e043a-e52b-7a61-a903-9f19759a93dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-7798-a1fc-95f1b569dd33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f3c-8b38-b64e77381db0" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-7798-a1fc-95f1b569dd33" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-7798-a1fc-95f1b569dd33_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-7798-a1fc-95f1b569dd33" xlink:to="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-7798-a1fc-95f1b569dd33_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-78ae-9d46-6c6bb2ab2416" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-7798-a1fc-95f1b569dd33" xlink:to="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-78ae-9d46-6c6bb2ab2416" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_EntitiesAffiliatedWithEnergyTransferLPMember_019e043a-e52b-7aab-b372-f2911f125c6b" xlink:href="usac-20260630.xsd#usac_EntitiesAffiliatedWithEnergyTransferLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-78ae-9d46-6c6bb2ab2416" xlink:to="loc_usac_EntitiesAffiliatedWithEnergyTransferLPMember_019e043a-e52b-7aab-b372-f2911f125c6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_EnergyTransferLPMember_019e043a-e52b-778c-a681-47493747fd78" xlink:href="usac-20260630.xsd#usac_EnergyTransferLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-78ae-9d46-6c6bb2ab2416" xlink:to="loc_usac_EnergyTransferLPMember_019e043a-e52b-778c-a681-47493747fd78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_019e043a-e52b-7518-9c40-e773a05980e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f3c-8b38-b64e77381db0" xlink:to="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_019e043a-e52b-7518-9c40-e773a05980e1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7518-9c40-e773a05980e1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_019e043a-e52b-7518-9c40-e773a05980e1" xlink:to="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7518-9c40-e773a05980e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7754-904c-5b4de5539217" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_019e043a-e52b-7518-9c40-e773a05980e1" xlink:to="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7754-904c-5b4de5539217" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDistributionMember_019e043a-e52b-7607-bff7-49d0dd270b64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7754-904c-5b4de5539217" xlink:to="loc_us-gaap_CashDistributionMember_019e043a-e52b-7607-bff7-49d0dd270b64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_DistributionReinvestmentPlanMember_019e043a-e52b-7479-93ce-ebe7cfecd4b4" xlink:href="usac-20260630.xsd#usac_DistributionReinvestmentPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7754-904c-5b4de5539217" xlink:to="loc_usac_DistributionReinvestmentPlanMember_019e043a-e52b-7479-93ce-ebe7cfecd4b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019e043a-e52b-76ba-8214-5b9f836025e8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f3c-8b38-b64e77381db0" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019e043a-e52b-76ba-8214-5b9f836025e8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-76ba-8214-5b9f836025e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019e043a-e52b-76ba-8214-5b9f836025e8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-76ba-8214-5b9f836025e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-7424-8c7c-42fe9e453fd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019e043a-e52b-76ba-8214-5b9f836025e8" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-7424-8c7c-42fe9e453fd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019e043a-e52b-7854-aa5c-ba6c50ba579b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-7424-8c7c-42fe9e453fd4" xlink:to="loc_us-gaap_SubsequentEventMember_019e043a-e52b-7854-aa5c-ba6c50ba579b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019fb3ae-b5c6-73ce-9bb9-15aaf2218578" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f3c-8b38-b64e77381db0" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019fb3ae-b5c6-73ce-9bb9-15aaf2218578" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019fb3ae-b5c6-73ce-9bb9-15aaf2218578_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019fb3ae-b5c6-73ce-9bb9-15aaf2218578" xlink:to="loc_us-gaap_ClassOfStockDomain_019fb3ae-b5c6-73ce-9bb9-15aaf2218578_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019fb3ae-b5c6-7584-9eb2-f748ef04b8f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019fb3ae-b5c6-73ce-9bb9-15aaf2218578" xlink:to="loc_us-gaap_ClassOfStockDomain_019fb3ae-b5c6-7584-9eb2-f748ef04b8f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_019fb3ae-b5c6-7bf8-aae0-5dd82b9787c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019fb3ae-b5c6-7584-9eb2-f748ef04b8f9" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_019fb3ae-b5c6-7bf8-aae0-5dd82b9787c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnersCapitalAccountUnits_019e043a-e52b-7339-aec2-6fc4f01d6e37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnersCapitalAccountUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7b17-9bca-790a904fcf86" xlink:to="loc_us-gaap_PartnersCapitalAccountUnits_019e043a-e52b-7339-aec2-6fc4f01d6e37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit_019e043a-e52b-76e9-9bc6-2c0ade0fa21d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7b17-9bca-790a904fcf86" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit_019e043a-e52b-76e9-9bc6-2c0ade0fa21d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_DistributionMadeToMemberOrLimitedPartnerNonCashDistributionsPaid_019e043a-e52b-76d4-bc33-3086a30928e4" xlink:href="usac-20260630.xsd#usac_DistributionMadeToMemberOrLimitedPartnerNonCashDistributionsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7b17-9bca-790a904fcf86" xlink:to="loc_usac_DistributionMadeToMemberOrLimitedPartnerNonCashDistributionsPaid_019e043a-e52b-76d4-bc33-3086a30928e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonUnitIssued_019e043a-e52b-796f-9ce6-d87de8ca2fef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonUnitIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7b17-9bca-790a904fcf86" xlink:to="loc_us-gaap_CommonUnitIssued_019e043a-e52b-796f-9ce6-d87de8ca2fef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019fb3ae-b5c6-7aa3-a5f7-963e996b6517" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7b17-9bca-790a904fcf86" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019fb3ae-b5c6-7aa3-a5f7-963e996b6517" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/PartnersCapitalDeficitCashDistributionsDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#PartnersCapitalDeficitCashDistributionsDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/PartnersCapitalDeficitCashDistributionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7427-b497-dcbbe3e7029e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalUnitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f1b-a027-8180678f0721" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfCapitalUnitsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7427-b497-dcbbe3e7029e" xlink:to="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f1b-a027-8180678f0721" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_019e043a-e52b-7671-94cd-99acb7e886a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f1b-a027-8180678f0721" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_019e043a-e52b-7671-94cd-99acb7e886a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7671-94cd-99acb7e886a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_019e043a-e52b-7671-94cd-99acb7e886a5" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7671-94cd-99acb7e886a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7e56-b2af-a9c27b8849fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountAxis_019e043a-e52b-7671-94cd-99acb7e886a5" xlink:to="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7e56-b2af-a9c27b8849fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnerMember_019e043a-e52b-7f9b-ba7a-c23dd0b38f30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PartnerTypeOfPartnersCapitalAccountNameDomain_019e043a-e52b-7e56-b2af-a9c27b8849fe" xlink:to="loc_us-gaap_LimitedPartnerMember_019e043a-e52b-7f9b-ba7a-c23dd0b38f30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-7f82-9400-f0f5cf328117" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountByClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f1b-a027-8180678f0721" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-7f82-9400-f0f5cf328117" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7f82-9400-f0f5cf328117_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-7f82-9400-f0f5cf328117" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7f82-9400-f0f5cf328117_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7f96-b72b-9563d0f72cae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedPartnersCapitalAccountClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountByClassAxis_019e043a-e52b-7f82-9400-f0f5cf328117" xlink:to="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7f96-b72b-9563d0f72cae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_CommonUnitsMember_019e043a-e52b-7975-b8d8-c8e5524bec78" xlink:href="usac-20260630.xsd#usac_CommonUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7f96-b72b-9563d0f72cae" xlink:to="loc_usac_CommonUnitsMember_019e043a-e52b-7975-b8d8-c8e5524bec78" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_PhantomAndRestrictedUnitholdersMember_019e043a-e52b-7634-bcea-ad6f77efddb6" xlink:href="usac-20260630.xsd#usac_PhantomAndRestrictedUnitholdersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LimitedPartnersCapitalAccountClassDomain_019e043a-e52b-7f96-b72b-9563d0f72cae" xlink:to="loc_usac_PhantomAndRestrictedUnitholdersMember_019e043a-e52b-7634-bcea-ad6f77efddb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_019e043a-e52b-7afe-98f6-3962393deaf0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7f1b-a027-8180678f0721" xlink:to="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_019e043a-e52b-7afe-98f6-3962393deaf0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7afe-98f6-3962393deaf0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_019e043a-e52b-7afe-98f6-3962393deaf0" xlink:to="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7afe-98f6-3962393deaf0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7097-8743-50c684b01c78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DistributionsMadeToMemberOrLimitedPartnerByDistributionTypeAxis_019e043a-e52b-7afe-98f6-3962393deaf0" xlink:to="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7097-8743-50c684b01c78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashDistributionMember_019e043a-e52b-7dea-8d90-dc2e10915d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashDistributionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionTypeDomain_019e043a-e52b-7097-8743-50c684b01c78" xlink:to="loc_us-gaap_CashDistributionMember_019e043a-e52b-7dea-8d90-dc2e10915d7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionsMadeToMembersOrLimitedPartnersAbstract_019e043a-e52b-7058-9b53-03d4860c7233" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionsMadeToMembersOrLimitedPartnersAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-7427-b497-dcbbe3e7029e" xlink:to="loc_us-gaap_DistributionsMadeToMembersOrLimitedPartnersAbstract_019e043a-e52b-7058-9b53-03d4860c7233" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit_019e043a-e52b-7540-a84c-620a6b959086" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionsMadeToMembersOrLimitedPartnersAbstract_019e043a-e52b-7058-9b53-03d4860c7233" xlink:to="loc_us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit_019e043a-e52b-7540-a84c-620a6b959086" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid_019e043a-e52b-7349-90dd-32a09cc20549" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DistributionsMadeToMembersOrLimitedPartnersAbstract_019e043a-e52b-7058-9b53-03d4860c7233" xlink:to="loc_us-gaap_DistributionMadeToLimitedLiabilityCompanyLLCMemberCashDistributionsPaid_019e043a-e52b-7349-90dd-32a09cc20549" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/PartnersCapitalDeficitIncomeperUnitDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#PartnersCapitalDeficitIncomeperUnitDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/PartnersCapitalDeficitIncomeperUnitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-78ef-aca8-4152c58689ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CapitalUnitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7055-a435-6df0da0fe584" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfCapitalUnitsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-78ef-aca8-4152c58689ae" xlink:to="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7055-a435-6df0da0fe584" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e043a-e52b-7830-b834-41b2a803c0b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7055-a435-6df0da0fe584" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e043a-e52b-7830-b834-41b2a803c0b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e043a-e52b-7830-b834-41b2a803c0b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e043a-e52b-7830-b834-41b2a803c0b0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e043a-e52b-7830-b834-41b2a803c0b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e043a-e52b-7d33-a0e0-829a6cb35b37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019e043a-e52b-7830-b834-41b2a803c0b0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e043a-e52b-7d33-a0e0-829a6cb35b37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_019e043a-e52b-75d8-bd0f-5a933f642390" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019e043a-e52b-7d33-a0e0-829a6cb35b37" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_019e043a-e52b-75d8-bd0f-5a933f642390" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019e043a-e52b-742c-bc5f-71fe29a15c41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCapitalUnitsTable_019e043a-e52b-7055-a435-6df0da0fe584" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019e043a-e52b-742c-bc5f-71fe29a15c41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e043a-e52b-742c-bc5f-71fe29a15c41_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e043a-e52b-742c-bc5f-71fe29a15c41" xlink:to="loc_us-gaap_ClassOfStockDomain_019e043a-e52b-742c-bc5f-71fe29a15c41_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019e043a-e52b-77ac-ad31-1c56e1656038" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019e043a-e52b-742c-bc5f-71fe29a15c41" xlink:to="loc_us-gaap_ClassOfStockDomain_019e043a-e52b-77ac-ad31-1c56e1656038" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PhantomShareUnitsPSUsMember_019e043a-e52b-7017-b631-ca40084652d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PhantomShareUnitsPSUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019e043a-e52b-77ac-ad31-1c56e1656038" xlink:to="loc_us-gaap_PhantomShareUnitsPSUsMember_019e043a-e52b-7017-b631-ca40084652d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019e043a-e52b-7225-b488-deee97edd61f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalUnitLineItems_019e043a-e52b-78ef-aca8-4152c58689ae" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment_019e043a-e52b-7225-b488-deee97edd61f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/RevenueRecognitionDisaggregatedRevenueDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#RevenueRecognitionDisaggregatedRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/RevenueRecognitionDisaggregatedRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019e043a-e52b-72b3-8152-1a325563d814" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019e043a-e52b-7c4b-8b4b-991a2ebb8792" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e043a-e52b-72b3-8152-1a325563d814" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019e043a-e52b-7c4b-8b4b-991a2ebb8792" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019e043a-e52b-7c45-a9c9-2394dab8745e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e043a-e52b-7c4b-8b4b-991a2ebb8792" xlink:to="loc_srt_ProductOrServiceAxis_019e043a-e52b-7c45-a9c9-2394dab8745e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e043a-e52b-7c45-a9c9-2394dab8745e_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019e043a-e52b-7c45-a9c9-2394dab8745e" xlink:to="loc_srt_ProductsAndServicesDomain_019e043a-e52b-7c45-a9c9-2394dab8745e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019e043a-e52b-790b-aa9c-a7b166841375" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019e043a-e52b-7c45-a9c9-2394dab8745e" xlink:to="loc_srt_ProductsAndServicesDomain_019e043a-e52b-790b-aa9c-a7b166841375" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_ContractOperationsRevenueMember_019e043a-e52b-71ce-843e-eb0dd5a6ea6c" xlink:href="usac-20260630.xsd#usac_ContractOperationsRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e043a-e52b-790b-aa9c-a7b166841375" xlink:to="loc_usac_ContractOperationsRevenueMember_019e043a-e52b-71ce-843e-eb0dd5a6ea6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_RetailPartsAndServicesMember_019e043a-e52b-7e5e-9f21-6592e8e56435" xlink:href="usac-20260630.xsd#usac_RetailPartsAndServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019e043a-e52b-790b-aa9c-a7b166841375" xlink:to="loc_usac_RetailPartsAndServicesMember_019e043a-e52b-7e5e-9f21-6592e8e56435" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019e043a-e52b-7e77-9edf-89482150c838" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019e043a-e52b-7c4b-8b4b-991a2ebb8792" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019e043a-e52b-7e77-9edf-89482150c838" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e043a-e52b-7e77-9edf-89482150c838_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019e043a-e52b-7e77-9edf-89482150c838" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e043a-e52b-7e77-9edf-89482150c838_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e043a-e52b-719b-a989-66899d228f17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_019e043a-e52b-7e77-9edf-89482150c838" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e043a-e52b-719b-a989-66899d228f17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredOverTimeMember_019e043a-e52b-7d9e-9961-b5fd862e3679" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferredOverTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e043a-e52b-719b-a989-66899d228f17" xlink:to="loc_us-gaap_TransferredOverTimeMember_019e043a-e52b-7d9e-9961-b5fd862e3679" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_TransferredDuringPrimaryTermMember_019e043a-e52b-7397-b482-f5a11e7eb343" xlink:href="usac-20260630.xsd#usac_TransferredDuringPrimaryTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransferredOverTimeMember_019e043a-e52b-7d9e-9961-b5fd862e3679" xlink:to="loc_usac_TransferredDuringPrimaryTermMember_019e043a-e52b-7397-b482-f5a11e7eb343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_TransferredMonthToMonthMember_019e043a-e52b-799a-aa81-6a68905e3f14" xlink:href="usac-20260630.xsd#usac_TransferredMonthToMonthMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransferredOverTimeMember_019e043a-e52b-7d9e-9961-b5fd862e3679" xlink:to="loc_usac_TransferredMonthToMonthMember_019e043a-e52b-799a-aa81-6a68905e3f14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_019e043a-e52b-7bcc-90ab-eef1733fc3ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferredAtPointInTimeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_019e043a-e52b-719b-a989-66899d228f17" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_019e043a-e52b-7bcc-90ab-eef1733fc3ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e043a-e52b-7c22-bc1b-cf2e260bfc62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019e043a-e52b-72b3-8152-1a325563d814" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e043a-e52b-7c22-bc1b-cf2e260bfc62" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/RevenueRecognitionPerformanceObligationDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#RevenueRecognitionPerformanceObligationDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/RevenueRecognitionPerformanceObligationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e043a-e52b-75a0-8e26-3759d3367351" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e043a-e52b-7061-a888-5a6f880fa29a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e043a-e52b-75a0-8e26-3759d3367351" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e043a-e52b-7061-a888-5a6f880fa29a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e043a-e52b-70cb-baa0-5b142307263d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e043a-e52b-7061-a888-5a6f880fa29a" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_019e043a-e52b-70cb-baa0-5b142307263d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e043a-e52b-7414-bcf5-f72e78eea07b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e043a-e52b-75a0-8e26-3759d3367351" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e043a-e52b-7414-bcf5-f72e78eea07b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e043a-e52b-7412-a46c-141974426372" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e043a-e52b-75a0-8e26-3759d3367351" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e043a-e52b-7412-a46c-141974426372" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/RevenueRecognitionPerformanceObligationDetails_1" xlink:type="simple" xlink:href="usac-20260630.xsd#RevenueRecognitionPerformanceObligationDetails_1"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/RevenueRecognitionPerformanceObligationDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e043a-e52b-75a0-8e26-3759d3367351" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e043a-e52b-7061-a888-5a6f880fa29a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e043a-e52b-75a0-8e26-3759d3367351" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_019e043a-e52b-7061-a888-5a6f880fa29a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligation_019e043a-e52b-7414-bcf5-f72e78eea07b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e043a-e52b-75a0-8e26-3759d3367351" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligation_019e043a-e52b-7414-bcf5-f72e78eea07b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e043a-e52b-7412-a46c-141974426372" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_019e043a-e52b-75a0-8e26-3759d3367351" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_019e043a-e52b-7412-a46c-141974426372" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/RelatedPartiesTransactionsNarrativeDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#RelatedPartiesTransactionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/RelatedPartiesTransactionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7358-99e0-b53739d83499" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7230-a32e-5df7ee41b0d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7358-99e0-b53739d83499" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7230-a32e-5df7ee41b0d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-750b-9ff8-f1f46274994d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7230-a32e-5df7ee41b0d7" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-750b-9ff8-f1f46274994d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-750b-9ff8-f1f46274994d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-750b-9ff8-f1f46274994d" xlink:to="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-750b-9ff8-f1f46274994d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-71ba-ba11-1f113348c8b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-750b-9ff8-f1f46274994d" xlink:to="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-71ba-ba11-1f113348c8b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_EnergyTransferLPMember_019e043a-e52b-7fb5-a276-b5558e005a52" xlink:href="usac-20260630.xsd#usac_EnergyTransferLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-71ba-ba11-1f113348c8b9" xlink:to="loc_usac_EnergyTransferLPMember_019e043a-e52b-7fb5-a276-b5558e005a52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_EntitiesAffiliatedWithEnergyTransferLPMember_019e043a-e52b-714e-a859-762bc4e82363" xlink:href="usac-20260630.xsd#usac_EntitiesAffiliatedWithEnergyTransferLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-71ba-ba11-1f113348c8b9" xlink:to="loc_usac_EntitiesAffiliatedWithEnergyTransferLPMember_019e043a-e52b-714e-a859-762bc4e82363" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019e043a-e52b-7b8a-8165-c216810affdd" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7230-a32e-5df7ee41b0d7" xlink:to="loc_srt_OwnershipAxis_019e043a-e52b-7b8a-8165-c216810affdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019e043a-e52b-7b8a-8165-c216810affdd_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019e043a-e52b-7b8a-8165-c216810affdd" xlink:to="loc_srt_OwnershipDomain_019e043a-e52b-7b8a-8165-c216810affdd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019e043a-e52b-74e5-bbe1-57b634040705" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019e043a-e52b-7b8a-8165-c216810affdd" xlink:to="loc_srt_OwnershipDomain_019e043a-e52b-74e5-bbe1-57b634040705" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_UsaCompressionPartnersLpMember_019e043a-e52b-79a0-9c26-b64e40ae73a3" xlink:href="usac-20260630.xsd#usac_UsaCompressionPartnersLpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019e043a-e52b-74e5-bbe1-57b634040705" xlink:to="loc_usac_UsaCompressionPartnersLpMember_019e043a-e52b-79a0-9c26-b64e40ae73a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_USACompressionGPLLCMember_019e043a-e52b-71e2-a7e1-8421d149433c" xlink:href="usac-20260630.xsd#usac_USACompressionGPLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019e043a-e52b-74e5-bbe1-57b634040705" xlink:to="loc_usac_USACompressionGPLLCMember_019e043a-e52b-71e2-a7e1-8421d149433c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e043a-e52b-7392-b109-4456f9c52991" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7230-a32e-5df7ee41b0d7" xlink:to="loc_dei_LegalEntityAxis_019e043a-e52b-7392-b109-4456f9c52991" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e043a-e52b-7392-b109-4456f9c52991_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_019e043a-e52b-7392-b109-4456f9c52991" xlink:to="loc_dei_EntityDomain_019e043a-e52b-7392-b109-4456f9c52991_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e043a-e52b-7384-8d93-4c582d21105d" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_019e043a-e52b-7392-b109-4456f9c52991" xlink:to="loc_dei_EntityDomain_019e043a-e52b-7384-8d93-4c582d21105d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_EnergyTransferLPMember_019e043a-e52b-7025-b132-5df0a7f2eaf2" xlink:href="usac-20260630.xsd#usac_EnergyTransferLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e043a-e52b-7384-8d93-4c582d21105d" xlink:to="loc_usac_EnergyTransferLPMember_019e043a-e52b-7025-b132-5df0a7f2eaf2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019e043a-e52b-7190-902a-b11396c4343a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7230-a32e-5df7ee41b0d7" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019e043a-e52b-7190-902a-b11396c4343a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e043a-e52b-7190-902a-b11396c4343a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e043a-e52b-7190-902a-b11396c4343a" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e043a-e52b-7190-902a-b11396c4343a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019e043a-e52b-7114-b003-f753f19ee451" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019e043a-e52b-7190-902a-b11396c4343a" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019e043a-e52b-7114-b003-f753f19ee451" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_SharedServicesCostsMember_019e043a-e52b-76c6-8f89-78bda655019c" xlink:href="usac-20260630.xsd#usac_SharedServicesCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019e043a-e52b-7114-b003-f753f19ee451" xlink:to="loc_usac_SharedServicesCostsMember_019e043a-e52b-76c6-8f89-78bda655019c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_019e043a-e52b-7eba-b83c-dbbf02f42cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7358-99e0-b53739d83499" xlink:to="loc_us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPMembersOrLimitedPartnersOwnershipInterest_019e043a-e52b-7eba-b83c-dbbf02f42cc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019e043a-e52b-780a-acde-9351957c4b03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7358-99e0-b53739d83499" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_019e043a-e52b-780a-acde-9351957c4b03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligation_019e043a-e52b-74ad-ac70-c34b26c3fa49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7358-99e0-b53739d83499" xlink:to="loc_us-gaap_PurchaseObligation_019e043a-e52b-74ad-ac70-c34b26c3fa49" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e043a-e52b-767a-b3ef-caa21ec6e0c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7358-99e0-b53739d83499" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e043a-e52b-767a-b3ef-caa21ec6e0c2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/RelatedPartiesTransactionsScheduleofRelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#RelatedPartiesTransactionsScheduleofRelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/RelatedPartiesTransactionsScheduleofRelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7984-8d12-2e3abe3606c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7409-b626-e4173b5afdad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7984-8d12-2e3abe3606c7" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7409-b626-e4173b5afdad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-7834-a8b2-4f9beac0d57a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019e043a-e52b-7409-b626-e4173b5afdad" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-7834-a8b2-4f9beac0d57a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-7834-a8b2-4f9beac0d57a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-7834-a8b2-4f9beac0d57a" xlink:to="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-7834-a8b2-4f9beac0d57a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-7c56-972d-1563a9f55c98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019e043a-e52b-7834-a8b2-4f9beac0d57a" xlink:to="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-7c56-972d-1563a9f55c98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_EntitiesAffiliatedWithEnergyTransferLPMember_019e043a-e52b-703e-81fd-e7104685ec4c" xlink:href="usac-20260630.xsd#usac_EntitiesAffiliatedWithEnergyTransferLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019e043a-e52b-7c56-972d-1563a9f55c98" xlink:to="loc_usac_EntitiesAffiliatedWithEnergyTransferLPMember_019e043a-e52b-703e-81fd-e7104685ec4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e043a-e52b-7da1-b3ae-b3b139c2331c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7984-8d12-2e3abe3606c7" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_019e043a-e52b-7da1-b3ae-b3b139c2331c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e043a-e52b-7b58-b927-20e847f8f465" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7984-8d12-2e3abe3606c7" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpense_019e043a-e52b-7b58-b927-20e847f8f465" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_019e043a-e52b-73b1-bfd8-ef3f3fd45c77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7984-8d12-2e3abe3606c7" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_019e043a-e52b-73b1-bfd8-ef3f3fd45c77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_019e043a-e52b-78c8-958e-fec7571f38e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7984-8d12-2e3abe3606c7" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_019e043a-e52b-78c8-958e-fec7571f38e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_019e043a-e52b-7d17-815f-88f1002802aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019e043a-e52b-7984-8d12-2e3abe3606c7" xlink:to="loc_us-gaap_AccountsPayableCurrent_019e043a-e52b-7d17-815f-88f1002802aa" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_019e043a-e52b-7a98-b168-248c8223480b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentTable_019e043a-e52b-707b-b284-80af40e077f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019e043a-e52b-7a98-b168-248c8223480b" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentTable_019e043a-e52b-707b-b284-80af40e077f6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e043a-e52b-722f-9c3a-a0d2c2681705" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentTable_019e043a-e52b-707b-b284-80af40e077f6" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e043a-e52b-722f-9c3a-a0d2c2681705" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e043a-e52b-722f-9c3a-a0d2c2681705_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e043a-e52b-722f-9c3a-a0d2c2681705" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e043a-e52b-722f-9c3a-a0d2c2681705_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e043a-e52b-79e6-9b19-1f29f83f8c75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019e043a-e52b-722f-9c3a-a0d2c2681705" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e043a-e52b-79e6-9b19-1f29f83f8c75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_019e043a-e52b-74c2-8c62-d6c05b50b2d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019e043a-e52b-79e6-9b19-1f29f83f8c75" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_019e043a-e52b-74c2-8c62-d6c05b50b2d5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019e043a-e52b-7683-adef-799e4e894e00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentTable_019e043a-e52b-707b-b284-80af40e077f6" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019e043a-e52b-7683-adef-799e4e894e00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e043a-e52b-7683-adef-799e4e894e00_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e043a-e52b-7683-adef-799e4e894e00" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e043a-e52b-7683-adef-799e4e894e00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019e043a-e52b-7f36-ad0b-c5ab72a408fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019e043a-e52b-7683-adef-799e4e894e00" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019e043a-e52b-7f36-ad0b-c5ab72a408fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_019e043a-e52b-7caa-b451-7afc6ca402d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019e043a-e52b-7f36-ad0b-c5ab72a408fb" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_019e043a-e52b-7caa-b451-7afc6ca402d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_019e043a-e52b-7d29-87cc-b8395e3d2ce7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentTable_019e043a-e52b-707b-b284-80af40e077f6" xlink:to="loc_srt_MajorCustomersAxis_019e043a-e52b-7d29-87cc-b8395e3d2ce7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019e043a-e52b-7d29-87cc-b8395e3d2ce7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_019e043a-e52b-7d29-87cc-b8395e3d2ce7" xlink:to="loc_srt_NameOfMajorCustomerDomain_019e043a-e52b-7d29-87cc-b8395e3d2ce7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_019e043a-e52b-7be3-adf5-b7bf3d25c894" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_019e043a-e52b-7d29-87cc-b8395e3d2ce7" xlink:to="loc_srt_NameOfMajorCustomerDomain_019e043a-e52b-7be3-adf5-b7bf3d25c894" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_OneUnnamedCustomerMember_019e043a-e52b-772f-82a0-cfd9878e3ae7" xlink:href="usac-20260630.xsd#usac_OneUnnamedCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_019e043a-e52b-7be3-adf5-b7bf3d25c894" xlink:to="loc_usac_OneUnnamedCustomerMember_019e043a-e52b-772f-82a0-cfd9878e3ae7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019e043a-e52b-78a2-bdab-a26ae8d4204f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentTable_019e043a-e52b-707b-b284-80af40e077f6" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019e043a-e52b-78a2-bdab-a26ae8d4204f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e043a-e52b-78a2-bdab-a26ae8d4204f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019e043a-e52b-78a2-bdab-a26ae8d4204f" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e043a-e52b-78a2-bdab-a26ae8d4204f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e043a-e52b-71c9-b7b7-9ee11277bd36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis_019e043a-e52b-78a2-bdab-a26ae8d4204f" xlink:to="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e043a-e52b-71c9-b7b7-9ee11277bd36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_PurchaseCompressionUnitsMember_019e043a-e52b-79a9-a92d-7d01e165b6e1" xlink:href="usac-20260630.xsd#usac_PurchaseCompressionUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e043a-e52b-71c9-b7b7-9ee11277bd36" xlink:to="loc_usac_PurchaseCompressionUnitsMember_019e043a-e52b-79a9-a92d-7d01e165b6e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_MajorManufacturingComponentsFOrCompressionUnitsMember_019e043a-e52b-7102-91b2-4ec6e181f251" xlink:href="usac-20260630.xsd#usac_MajorManufacturingComponentsFOrCompressionUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PurchaseCommitmentExcludingLongtermCommitmentDomain_019e043a-e52b-71c9-b7b7-9ee11277bd36" xlink:to="loc_usac_MajorManufacturingComponentsFOrCompressionUnitsMember_019e043a-e52b-7102-91b2-4ec6e181f251" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_019e043a-e52b-7bd0-a91e-0629c89c6940" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019e043a-e52b-7a98-b168-248c8223480b" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_019e043a-e52b-7bd0-a91e-0629c89c6940" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligation_019e043a-e52b-7990-b33c-9a21fda00a34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019e043a-e52b-7a98-b168-248c8223480b" xlink:to="loc_us-gaap_PurchaseObligation_019e043a-e52b-7990-b33c-9a21fda00a34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_019e043a-e52b-701e-8742-9941f659a78b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PurchaseObligationDueInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019e043a-e52b-7a98-b168-248c8223480b" xlink:to="loc_us-gaap_PurchaseObligationDueInNextTwelveMonths_019e043a-e52b-701e-8742-9941f659a78b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.usacompression.com/role/SubsequentEventDetails" xlink:type="simple" xlink:href="usac-20260630.xsd#SubsequentEventDetails"/>
  <link:definitionLink xlink:role="http://www.usacompression.com/role/SubsequentEventDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventLineItems_019e043a-e52b-74a1-a39d-2cf3ecf2ac85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTable_019e043a-e52b-76d6-acdc-4ef6df83655c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e043a-e52b-74a1-a39d-2cf3ecf2ac85" xlink:to="loc_us-gaap_SubsequentEventTable_019e043a-e52b-76d6-acdc-4ef6df83655c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019e043a-e52b-736d-9c91-ffb82c71ce79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019e043a-e52b-76d6-acdc-4ef6df83655c" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019e043a-e52b-736d-9c91-ffb82c71ce79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-736d-9c91-ffb82c71ce79_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019e043a-e52b-736d-9c91-ffb82c71ce79" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-736d-9c91-ffb82c71ce79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-7686-aa05-717c3116171b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019e043a-e52b-736d-9c91-ffb82c71ce79" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-7686-aa05-717c3116171b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019e043a-e52b-73e0-8475-0e4c35faf6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019e043a-e52b-7686-aa05-717c3116171b" xlink:to="loc_us-gaap_SubsequentEventMember_019e043a-e52b-73e0-8475-0e4c35faf6bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019fce5d-0258-7b33-82b6-edfe22a15054" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_019e043a-e52b-76d6-acdc-4ef6df83655c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019fce5d-0258-7b33-82b6-edfe22a15054" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fce5d-0258-7b33-82b6-edfe22a15054_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019fce5d-0258-7b33-82b6-edfe22a15054" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fce5d-0258-7b33-82b6-edfe22a15054_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fce5d-0258-71a8-b44b-7cf22e1f95c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019fce5d-0258-7b33-82b6-edfe22a15054" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fce5d-0258-71a8-b44b-7cf22e1f95c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_JWPowerCompanyMember_019fce5d-3536-7ff1-ba67-10c594ebf148" xlink:href="usac-20260630.xsd#usac_JWPowerCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019fce5d-0258-71a8-b44b-7cf22e1f95c0" xlink:to="loc_usac_JWPowerCompanyMember_019fce5d-3536-7ff1-ba67-10c594ebf148" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred_019fce54-7c33-7d7d-8c8b-2539e1fb134b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e043a-e52b-74a1-a39d-2cf3ecf2ac85" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred_019fce54-7c33-7d7d-8c8b-2539e1fb134b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentEquityInterests_019fce55-634c-7458-ae4e-558c87446312" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentEquityInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e043a-e52b-74a1-a39d-2cf3ecf2ac85" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentEquityInterests_019fce55-634c-7458-ae4e-558c87446312" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_usac_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCash_019fce59-9672-70bc-8b70-b3e473dc79ce" xlink:href="usac-20260630.xsd#usac_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_019e043a-e52b-74a1-a39d-2cf3ecf2ac85" xlink:to="loc_usac_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCash_019fce59-9672-70bc-8b70-b3e473dc79ce" xlink:type="arc" order="2"/>
  </link:definitionLink>
</link:linkbase>
