CONTERMINOUS

coextensive, coterminous, conterminous

(adjective) being of equal extent or scope or duration

adjacent, conterminous, contiguous, neighboring

(adjective) having a common boundary or edge; abutting; touching; “Rhode Island has two bordering states; Massachusetts and Connecticut”; “the side of Germany conterminous with France”; “Utah and the contiguous state of Idaho”; “neighboring cities”

conterminous, contiguous

(adjective) connecting without a break; within a common boundary; “the 48 conterminous states”; “the contiguous 48 states”

Source: WordNet® 3.1

Adjective

conterminous (comparative more conterminous, superlative most conterminous)

Alternative form of coterminous

Source: Wiktionary

Con*ter"mi*nous, a. Etym: [L. conterminus. Cf. Conterminous.]

Definition: Having the same bounds, or limits; bordering upon; contiguous. This conformed so many of them as were conterminous to the colonies and garrisons, to the Roman laws. Sir M. Hale.

Source: Webster’s Unabridged Dictionary 1913 Edition