/ Dictionary / Index I illative: Meaning and Definition of Find definitions for: il•la•tive Pronunciation: (il'u-tiv, i-lā'tiv), [key] — adj. of, pertaining to, or expressing illation; inferential: an illative word such as “therefore.” noting a case, as in Finnish, whose distinctive function is to indicate place into or toward which. —n. the illative case. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: illative (Thesaurus) illation illaudable 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