[ahy-suh-rith-uh m]
noun 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.

Origin of isorhythm

First recorded in 1950–55; iso- + rhythm
Related formsi·so·rhyth·mic, adjectivei·so·rhyth·mi·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018