noun or·ga·num \ˈȯr-gə-nəm\

Definition of organum

  1. 1 :  early polyphony of the late Middle Ages that consists of one or more voice parts accompanying the cantus firmus often in parallel motion at a fourth, fifth, or octave above or below; also :  a composition in this style

  2. 2 :  organon

Origin and Etymology of organum

Medieval Latin, from Latin, organ

First Known Use: 1620

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