/ Dictionary / Index T tantamount: Meaning and Definition of Find definitions for: tan•ta•mount Pronunciation: (tan'tu-mount"), [key] — adj. equivalent, as in value, force, effect, or signification: His angry speech was tantamount to a declaration of war. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tantamount (Thesaurus) tantalus monkey tantara Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language