The best replacement for adaptation is evolution.

The best alternatives to adaptation are rated as following:
★★★★★  evolution
★★★★  mitigation
★★★  adaption
★★★  modification
★★★  standardization
★★  acclimation
★★  natural selection
★★  habituation
★  mutation
★  accommodation
★  adoption
★  exaptation
★  acclimatization
★  variation
★  extinction
★  mitigation climate change
  standardisation
  adjustment
  standardization marketing
  appropriation
  peripheral adaptation
  translation
  selection
  assimilation
  product standardization
  fatigue
  autoplastic adaptation
  adaptation
  behavior adaptation
  sensory adaptation

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Speaking about adaptation, one probably shouldn't forget about selection.

Other search terms related to adaptation and their ratings are:
★★★★★ selection
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Google Trends

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adaptation
evolution
mitigation