organum

noun
or·ga·num | \ˈȯr-gə-nəm \

Definition of organum 

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 : organon

First Known Use of organum

1620, in the meaning defined at sense 2

History and Etymology for organum

Medieval Latin, from Latin, organ

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The first known use of organum was in 1620

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Britannica.com: Encyclopedia article about organum

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