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Meaning of isorhythm

i•so•rhythm

Pronunciation: (ī'su-ri"um), [key]
— n. Music.
  1. a structural feature characteristic of the Ars Nova motet, consisting of a single rhythmic phrase pattern repeated, usually in the tenor, throughout the composition.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.