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[ahy-suh-rith-uh m] /ˈaɪ səˌrɪð əm/
noun, Music.
a structural feature characteristic of the Ars Nova motet, consisting of a single rhythmic phrase pattern repeated, usually in the tenor, throughout the composition.
1950-55; iso- + rhythm
Related forms
isorhythmic, adjective
isorhythmically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for isorhythm

in music, the organizing principle of much of 14th-century French polyphony, characterized by the extension of the rhythmic texture (talea) of an initial section to the entire composition, despite the variation of corresponding melodic features (color); the term was coined around 1900 by the German musicologist Friedrich Ludwig.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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