Breadcrumb Home > Dictionary > Index W weight density: Meaning and Definition of Find definitions for: weight' den"sity Pronunciation: [key] the weight per unit volume of a substance or object. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. weight belt weighted ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language