The Collaborative International Dictionary of English v.0.48:
Coterminous \Co*ter"mi*nous\ (k?-t?r"m?-n?s), a. [Cf. Conterminous.] Bordering; conterminous; -- followed by with. [1913 Webster]WordNet (r) 3.0 (2006):
coterminous adj 1: being of equal extent or scope or duration [syn: coextensive, coterminous, conterminous]