/ Dictionary / Index G Gc: Meaning and Definition of Find definitions for: Gc Pronunciation: [key] gigacycle; gigacycles. gigacycles per second. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gc (Thesaurus) G.B.E. GCA 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