/ Dictionary / Index D decomposition: Meaning and Definition of Find definitions for: de•com•po•si•tion Pronunciation: (dē"kom-pu-zish'un), [key] — n. the act or process of decomposing. the state of being decomposed; decay. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: decomposition (Thesaurus) decomposer decompound Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language