Adjacent

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late Middle English: from Latin adjacent- ‘lying near to’, from adjacere, from ad- ‘to’ + jacere ‘lie down’.

wiktionary

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Borrowed from Latin adiacēns, adiacentis, derivative of adiaceo(“I lie beside”); from ad(“to”) + iaceo(“I lie down”).

etymonline

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adjacent (adj.)

early 15c., "contiguous, bordering; close, nearby," from Latin adiacentem (nominative adiacens) "lying at," present participle of adiacere "lie at, border upon, lie near," from ad "to" (see ad-) + iacēre "to lie, rest," related to iacere "to throw; lay ('cast (oneself) down')," from PIE root *ye- "to throw, impel." Only of things, never of persons or animals. Adjacent, properly, is near but not necessarily in contact; adjoining is so as to touch. Latin adiacentia meant "the neighborhood."