/ Dictionary / Index C ctf: Meaning and Definition of Find definitions for: ctf Pronunciation: [key] certificate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ctesiphon ctg. Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language