/ Dictionary / Index T t.i.d.: Meaning and Definition of Find definitions for: t.i.d. Pronunciation: [key] (in prescriptions) three times a day. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tictoc tidal Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language