/ Dictionary / Index M mM: Meaning and Definition of Find definitions for: mM Pronunciation: [key] millimole; millimoles. mm Pronunciation: [key] millimeter; millimeters. MM. Pronunciation: [key] Messieurs. mm. Pronunciation: [key] measures. thousands. millimeter; millimeters. M.M. Pronunciation: [key] Master Mason. Master Mechanic. Master of Music. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mm (Thesaurus) mlx Mmabatho Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language