/ Dictionary / Index M MADD: Meaning and Definition of Find definitions for: MADD Pronunciation: (mad), [key] — n. Mothers Against Drunk Driving. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. madcap madden Related Content Daily Word Quiz: overture Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language