/ Dictionary / Index G g.t.c.: Meaning and Definition of Find definitions for: g.t.c. Pronunciation: [key] good till canceled. good till countermanded. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Gt. Br. gtd. Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language