conterminous (adj) – sharing a common border or boundary; having the same scope, extent, or range; meeting at the ends (also coterminous)
BREAKDOWN: CON- (with) + TERMIN- (end or border) + -OUS (full of)
This word is built on the root TERM-, which means end, limit, or border.
Common TERM- words include determine, determined, exterminate, term, and terminology.
More esoteric TERM- words include determinative, deterministic, predetermine, and terminus.