Definition of: polyphonic

(pol′i·fon′ik) adjective
1. Phonet. Representing more than one sound or combination of sounds, as some written characters.
2. Consisting of many sounds or voices.
3. Music a Designating or involving the simultaneous and harmonious combination of two or more independent parts or melodies. b Denoting an instrument, as a piano, by which two or more sounds may be produced simultaneously. Also po·lyph·o·nous (pə·lif′ə·nəs). [<Gk. polyphōnos having many tones <poly- many + phōnē a voice, sound]