adjective 1.consisting of many voices or sounds.
2.Music.a.having two or more voices or parts, each with an
independent melody, but all harmonizing; contrapuntal (opposed to
homophonic ).
b.pertaining to music of this kind.
c.capable of producing more than one tone at a time, as an organ or a harp.
3.Phonetics. having more than one phonetic value, as the letter s, that is voiced (z) in nose and unvoiced (s) in salt.
Related forms pol·y·phon·i·cal·ly, adverb