- an early type of polyphony based on plainsong, in which the voices are separated by an interval of a fourth, fifth, or octave
- a composition in this style
Origin of organumL: see organ
nounpl. or·ga·na or or·ga·nums
Origin of organumMedieval Latin, from Late Latin, church organ, from Latin, instrument; see organ.
From Latin organum, from Ancient Greek á½„ÏÎ³Î±Î½Î¿Î½ (organon, “organ, instrument, tool").