nounpl. -·nums or -·na
- 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
Any of several types of medieval vocal polyphony, usually based on Gregorian chant.
Origin of organumMedieval Latin from Late Latin church organ from Latin instrument ; see organ .
Variant of organon
From Latin organum, from Ancient Greek á½„ÏÎ³Î±Î½Î¿Î½ (organon, “organ, instrument, tool").