/ Dictionary / Index M Mersenne: Meaning and Definition of Find definitions for: Mer•senne Pronunciation: (mur-sen' Fr. mer-sen'), [key] 1588–1648, French mathematician. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Merry Wives of Windsor, The* Mersenne number Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language