/ Dictionary / Index A additive inverse: Meaning and Definition of Find definitions for: ad'ditive in'verse Pronunciation: [key] — Math. Math. the number in the set of real numbers that when added to a given number will yield zero: The additive inverse of 2 is −2. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. additive identity additive process Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language