/ Dictionary / Index D dilution: Meaning and Definition of Find definitions for: di•lu•tion Pronunciation: (di-l'shun, dī-), [key] — n. the act of diluting or the state of being diluted. something diluted. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: dilution (Thesaurus) dilute diluvial Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language