/ Dictionary / Index A accum.: Meaning and Definition of Find definitions for: accum. Pronunciation: [key] accumulative. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acculturize accumbent Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language