Present tense form meaning to be next to and joined with something else; to be adjacent to.
From adjoin (ad- + jungere 'join'). Standard third-person singular present tense form.
The word 'join' contains the same root as 'adjoin,' but adds 'ad-' (to)—so it literally means 'join to,' which is more specific than just 'join' and captures spatial relationships perfectly.
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