Source : Webster's Revised Unabridged Dictionary (1913)

Homophonic \Ho`mo*phon"ic\, Homophonous \Ho*moph"o*nous\, a.
   [Gr. ?; ? the same + ? sound, tone: cf. F. homophone.]
   1. (Mus.)
      (a) Originally, sounding alike; of the same pitch;
          unisonous; monodic.
      (b) Now used for plain harmony, note against note, as
          opposed to polyphonic harmony, in which the several
          parts move independently, each with its own melody.

   2. Expressing the same sound by a different combination of
      letters; as, bay and bey.

Source : WordNet®

homophonic
     adj 1: having the same sound
     2: having a single melodic line with accompaniment