Appropriate

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late Middle English: from late Latin appropriatus, past participle of appropriare ‘make one's own’, from ad- ‘to’ + proprius ‘own, proper’.

wiktionary

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From Middle English appropriaten, borrowed from Latin appropriatus, past participle of approprio(“to make one's own”), from ad(“to”) + proprio(“to make one's own”), from proprius(“one's own, private”).

etymonline

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appropriate (v.)

early 15c., "take possession of, take exclusively," from Late Latin appropriatus, past participle of appropriare, adpropriare "to make one's own," from Latin ad "to" (see ad-) + propriare "take as one's own," from proprius "one's own" (see proper). Related: Appropriated; appropriating.

appropriate (adj.)

"specially suitable, proper," early 15c., from Latin appropriatus, past participle of appropriare "make one's own" (see appropriate (v.)). Related: Appropriately; appropriateness.