Illinoian

Ill·i·noi·an
I1L1L1I1N1O1I1A1N1
US/ˌɪləˈnɔɪən/

adjective

Of or relating to the Illinoian stage.

“the Illinoian glaciation”

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Meanings

adjectiveIllinoian (not comparable)
  1. alternativenot comparableAlternative form of Illinoisan.
  2. not comparablegeographyOf or relating to the Illinoian stage.

    the Illinoian glaciation

nounIllinoian (plural Illinoians)

plural Illinoians

  1. alternativeAlternative form of Illinoisan.
proper nounthe Illinoian
  1. geographyA stage of the last Ice Age in North America, lasting from around 190,000 to 130,000 years ago.

Origin

From Illinois + -an.

Full word history & related roots →
Cite this entry
APA

Illinoian. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Illinoian

MLA

“Illinoian.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Illinoian. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Illinoian,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Illinoian.

Source: Illinoian on Wiktionary, CC BY-SA 4.0.