/ Dictionary / Index I Illinoisan: Meaning and Definition of Find definitions for: Il•li•nois•an Pronunciation: (il"u-noi'un or, sometimes, -noi'zun), [key] — n. a native or inhabitant of Illinois. —adj. of or pertaining to Illinois or its inhabitants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: illinoisan (Thesaurus) Illinois ill-intentioned Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language