state in southwestern U.S., from Choctaw (Muskogean), literally "red people," from okla "nation, people" + homma "red." Coined by Choctaw scholar and Presbyterian minister Allen Wright (1826-1885), later principal chief of the Choctaw Nation, and first used in the Choctaw-Chickasaw treaty of April 28, 1866. Organized as a U.S. territory 1889; admitted as a state 1907. Related: Oklahoman.
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