/ Dictionary / Index T tranquillity: Meaning and Definition of Find definitions for: tran•quil•li•ty Pronunciation: (trang-kwil'i-tē), [key] — n. quality or state of being tranquil; calmness; peacefulness; quiet; serenity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tranquillity (Thesaurus) tranquilizer trans- Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language