/ Dictionary / Index I illuviation: Meaning and Definition of Find definitions for: il•lu•vi•a•tion Pronunciation: (i-l"vē-ā'shun), [key] — n. the accumulation in one layer of soil of materials that have been leached out of another layer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. illuviate illuvium Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language