/ Dictionary / Index G G.B.: Meaning and Definition of Find definitions for: G.B. Pronunciation: [key] Great Britain. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gb (Thesaurus) gazump Gbari Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language