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Meaning of Illinoian

Il•li•noi•an

Pronunciation: (il"u-noi'un), [key]
— n.
  1. the third stage of the glaciation of North America during the Pleistocene.
  2. Illinoisan.
—adj.
  1. of or pertaining to the Illinoian stage.
  2. Illinoisan.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.