noun

• A state of the United States, named for the people.
• A confederation of Algonquian tribes who lived in the Mississippi River Valley.
• The Algonquian language spoken by these tribes; the Miami-Illinois language.
• A river in United States that flows from Grundy County, Illinois into the Mississippi River.
• A river in Colorado, United States that flows from the Never Summer Mountains in the Rockies into the Michigan River.
• A river in Oklahoma, United States that flows from the Ozarks into the Arkansas River.
• A river in Oregon, United States that flows from the southwestern corner of the state into the Rogue River.
• Some townships in the United States, listed under Illinois Township.
• University of Illinois at Urbana–Champaign.
• A member of the above-mentioned tribe.