Adjacent means next to or very near something else. It is often used for places, rooms, or objects that share a border or side.
From Latin 'adjacens', present participle of 'adjacere' (to lie near), from 'ad-' (to) + 'jacere' (to lie). It has always described physical nearness.
Adjacent is a precise way of saying 'neighbors'—two things lying right next to each other. In math, adjacent angles even share a side and a point, like roommates sharing a wall.
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