/ Dictionary / Index M massive: Meaning and Definition of Find definitions for: mas•sive Pronunciation: (mas'iv), [key] — adj. consisting of or forming a large mass; bulky and heavy: massive columns. large and heavy-looking: a massive forehead. large in scale, amount, or degree: a massive breakdown in communications; massive reductions in spending. solid or substantial; great or imposing: massive erudition. having no outward crystal form, although sometimes crystalline in internal structure. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: massive (Thesaurus) Massinisa massive retaliation Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language