The state of being adjacent; the quality of being next to, beside, or adjoining something.
From adjacent (from Latin adjacens) + -cy (suffix forming nouns). This noun form allows speakers to discuss the abstract concept of things being next to each other.
Computer scientists use 'adjacency matrices' to map networks—the term 'adjacency' lets them mathematically capture which computers or people are 'neighbors' in a network, turning spatial concepts into pure logic.
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