/ Dictionary / Index A additive group: Meaning and Definition of Find definitions for: ad'ditive group" Pronunciation: [key] — Math. Math. a group in which the operation of the group is addition. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. additive color additive identity 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