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n. pl. Illinois
1. A member of a confederacy of Native American peoples formerly inhabiting southern Wisconsin, northern Illinois, and parts of eastern Iowa and Missouri, with a present-day population mostly in Oklahoma.
2. The Algonquian language of the Illinois.
[French, variant of earlier ilinoüek, of Algonquian origin, perhaps meaning "those who speak normally" and ultimately from Proto-Algonquian *elen-, regular, ordinary, in Algonquian fashion + *we·-, make sound, speak.]
Il·li·nois 2(ĭl′ə-noi′) Abbr. IL or Ill.
A state of the north-central United States. It was admitted as the 21st state in 1818. The area was explored by the French in the late 1600s, ceded by France to the British in 1763, and ceded by them to the newly formed United States in 1783. Springfield is the capital and Chicago the largest city.
Il′li·nois′an (-noi′ən) adj. & n.
(Placename) a native or inhabitant of Illinois
(Placename) of or relating to Illinois or its inhabitants