/ Dictionary / Index M mensural music: Meaning and Definition of Find definitions for: men'sural mu'sic Pronunciation: [key] polyphonic music of the 13th century in which each note has a strictly determined value. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mensural mensural notation Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language