/ Dictionary / Index T Tacitus: Meaning and Definition of Find definitions for: Tac•i•tus Pronunciation: (tas'i-tus), [key] — n. a.d. c55–c120, Roman historian. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tacitus (Thesaurus) taciturnity tack Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language