/ Dictionary / Index M M.Mus.: Meaning and Definition of Find definitions for: M.Mus. Pronunciation: [key] Master of Music. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. MMT M.Mus.Ed. Related Content Daily Word Quiz: tranquil Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language