To border on, be adjacent to, or touch the edge or boundary of something else.
From Old French 'abouter' (to border on), from 'a-' (to) plus 'bout' (end or boundary), meaning to be at the end next to something.
In real estate, 'abutting' properties is legally important because neighbors can dispute boundaries and access rights—it's why property lines that abut are some of the most litigated relationships in civil law.
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