/ Dictionary / Index G gtd.: Meaning and Definition of Find definitions for: gtd. Pronunciation: [key] guaranteed. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. g.t.c. GTO 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