/ Dictionary / Index G gravitational mass: Meaning and Definition of Find definitions for: grav'ita'tional mass' Pronunciation: [key] — Physics. Physics. the mass of a body as measured by its gravitational attraction for other bodies. Cf. inertial mass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. gravitational lens gravitational radius Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language