Adapt

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late Middle English: from French adapter, from Latin adaptare, from ad- ‘to’ + aptare (from aptus ‘fit’).

wiktionary

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From Middle French adapter, from Latin adaptare(“to fit to”), from ad(“to”) + aptare(“to make fit”), from aptus(“fit”); see apt.

etymonline

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adapt (v.)

early 15c. (implied in adapted) "to fit (something, for some purpose)," from Old French adapter (14c.), from Latin adaptare "adjust, fit to," from ad "to" (see ad-) + aptare "to join," from aptus "fitted" (see apt). Intransitive meaning "to undergo modification so as to fit new circumstances" is from 1956. Related: Adapting.