The quality or state of being adjacent; the condition of being next to or adjoining something.
From adjacent (from Latin adjacens, present participle of adjacere meaning 'to lie near') + -ence (suffix forming nouns indicating quality or state). The Latin root comes from ad- (to) + jacere (to lie).
Mathematicians and logicians use 'adjacence' to describe relationships that matter—in graph theory, which nodes are adjacent determines how information flows, which is why precise terminology for 'nextness' matters in computing.
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