/ Dictionary / Index M mass wasting: Meaning and Definition of Find definitions for: mass' wast'ing Pronunciation: [key] downhill movement of soil and rock fragments induced by gravity. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mass transit massy Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language