/ Dictionary / Index C cumulation: Meaning and Definition of Find definitions for: cu•mu•la•tion Pronunciation: (ky"myu-lā'shun), [key] — n. the act of cumulating; accumulation. a heap; mass. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cumulation (Thesaurus) cumulate cumulative Related Content Daily Word Quiz: confectionery Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language