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Meaning of organum

or•ga•num

Pronunciation: (ôr'gu-num), [key]
— pl. -na -nums.
  1. an organon.
    1. the doubling, or simultaneous singing, of a melody at an interval of either a fourth, a fifth, or an octave.
    2. the second part in such singing.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.