Etymology
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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."

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Definitions of adjacent

adjacent (adj.)
having a common boundary or edge; abutting; touching; "Rhode Island has two bordering states; Massachusetts and Connecticut";
Synonyms: conterminous / contiguous / neighboring
adjacent (adj.)
nearest in space or position; immediately adjoining without intervening space;
had adjacent rooms
Synonyms: next / side by side
adjacent (adj.)
near or close to but not necessarily touching;
lands adjacent to the mountains
New York and adjacent cities
From wordnet.princeton.edu