Source : Webster's Revised Unabridged Dictionary (1913)

Coterminous \Co*ter"mi*nous\ (k?-t?r"m?-n?s), a. [Cf.
   {Conterminous}.]
   Bordering; conterminous; -- followed by with.

Source : WordNet®

coterminous
     adj : of equal extent or scope or duration [syn: {coextensive}, {conterminous}]