polyphony (n.)

1828, "multiplicity of sounds," from Greek polyphonia "variety of sounds," from polyphonos "having many sounds or voices," from polys "many" (from PIE root *pele- (1) "to fill") + phone "voice, sound," from PIE root *bha- (2) "to speak, tell, say." The meaning "counterpoint" (1864) is perhaps a back-formation from the adjective.

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