/ Dictionary / Index A additory: Meaning and Definition of Find definitions for: ad•di•to•ry Pronunciation: (ad'i-tôr"ē, -tōr"ē), [key] — adj. capable of or tending to make an addition; additional; supplementary. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. additive process addle 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