consisting of many voices or sounds.

Music .

having two or more voices or parts, each with an independent melody, but all harmonizing; contrapuntal ( opposed to homophonic ).

pertaining to music of this kind.

capable of producing more than one tone at a time, as an organ or a harp.

Phonetics . having more than one phonetic value, as the letter s, that is voiced (z) in nose and unvoiced (s) in salt.