/ Dictionary / Index G GCA: Meaning and Definition of Find definitions for: GCA Pronunciation: [key] Girls' Clubs of America. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: gca (Thesaurus) Gc g-cal 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