Source : Webster's Revised Unabridged Dictionary (1913)

Homonym \Hom"o*nym\, n. [Cf. F. homonyme. See {Homonymous}.]
   A word having the same sound as another, but differing from
   it in meaning; as the noun bear and the verb bear. [Written
   also {homonyme}.]

Source : WordNet®

homonym
     n : two words are homonyms if they are pronounced or spelled the
         same way but have different meanings