/ Dictionary / Index I illation: Meaning and Definition of Find definitions for: il•la•tion Pronunciation: (i-lā'shun), [key] — n. the act of inferring. an inference; conclusion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: illation (Thesaurus) Illampu illative Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language