/ Dictionary / Index T TBD: Meaning and Definition of Find definitions for: TBD Pronunciation: [key] to be determined. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. T-bar lift TBI Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language