Kind of music notation

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Mensural \Men"su*ral\, a. [L. mensuralis.] Of or pertaining to measure.

WordNet Word definitions in WordNet
adj. of or relating to measure having notes of fixed rhythmic value

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"pertaining to measure, measurable," c.1600, from Medieval Latin mensuralis , from Latin mensura "a measuring, measurement" (see measure (v.)).

Wiktionary Word definitions in Wiktionary
a. 1 Of or pertaining to measure or measurement. 2 (context music English) Having a fixed rhythm.