Illinois

¹ American  

[il-uh-noi, -noiz] / ˌɪl əˈnɔɪ, -ˈnɔɪz /

noun

1. a member of a confederacy of North American Indians of Algonquian stock, formerly occupying Illinois and adjoining regions westward.

2. the Algonquian language of the Illinois and Miami Indians.

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Illinois ² American  

[il-uh-noi, -noiz] / ˌɪl əˈnɔɪ, -ˈnɔɪz /

noun

1. a state in the central United States: a part of the Midwest. 56,400 sq. mi. (146,075 sq. km). Springfield. IL (for use with zip code), Ill.

2. a river flowing southwest from northeastern Illinois to the Mississippi River: connected by a canal with Lake Michigan. 273 miles (440 km) long.

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Illinois British  

/ ˌɪlɪˈnɔɪ /

noun

1. Abbreviation: Ill..   IL.  a state of the N central US, in the Midwest: consists of level prairie crossed by the Illinois and Kaskaskia Rivers; mainly agricultural. Capital: Springfield. Pop: 12 653 544 (2003 est). Area: 144 858 sq km (55 930 sq miles)

2. a river in Illinois, flowing SW to the Mississippi. Length: 439 km (273 miles)

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Illinois Cultural  

1. State in the north-central United States bordered on the north by Wisconsin, the east by Indiana, the south by Kentucky, and the west by Missouri and Iowa. Its capital is Springfield, and its largest city is Chicago.

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Pronunciation

The pronunciation of Illinois with a final , which occurs chiefly among less educated speakers, is least common in Illinois itself, increasing in frequency as distance from the state increases.

Discover More

Known as the “Land of Lincoln” because Abraham Lincoln began his political career there.

Other Word Forms

Inflected Forms

noun

• Illinois
  plural

Etymology

Origin of Illinois

1715–25, < French, earlier Eriniouai, Ilinoués, etc., from an unidentified Algonquian language, apparently literally, “one who sounds normal” (i.e., “a person who speaks an Algonquian language”), equivalent to the (unattested) Proto-Algonquian elements elen- “ordinary” + -we “make sound”

Example Sentences

What was in the water in Park Forest, Illinois?

From Salon • Jun. 9, 2026

Jonathan Pearce: Born in Illinois, this attacking midfielder actually played twice for the US in 2025 before switching allegiance to the country of his parents last November.

From BBC • Jun. 9, 2026

She started support groups more than 20 years ago throughout her home state of Illinois to help other grandfamilies.

From MarketWatch • Jun. 8, 2026

The fourth spot was tied between Illinois and Ohio, with 29 companies each.

From Los Angeles Times • Jun. 6, 2026

Some trains traveled even farther westward into Indiana and on to the growing industrial cities of Gary, Indiana, and Chicago, Illinois.

From "Reaching for the Moon" by Katherine Johnson