/ Dictionary / Index M Mdm.: Meaning and Definition of Find definitions for: Mdm. Pronunciation: [key] — pl. Mdms. Madam. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mdlle. MDMA Related Content Daily Word Quiz: stellar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language