/ Dictionary / Index G gravisphere: Meaning and Definition of Find definitions for: grav•i•sphere Pronunciation: (grav'u-sfēr"), [key] — n. the area in which the gravitational force of a celestial body is predominant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. graving piece gravitas Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language