Illinois /ˌɪləˈnɔɪ/adjective 1noun 2 adjective1 •Of or relating to the Illinois Confederacy, its people or its culture. noun2 •A state of the United States, named for the people.Democratic Gov. JB Pritzker of Illinois said in a social media post that he is “aware of the troubling incident that has unfolded in Franklin Park.” — 2025 •A member of the above-mentioned tribe.