Also called Sioux.a member of the largest tribe of the Siouan stock of North American Indians, who originally occupied Minnesota and Wisconsin and later migrated westward to the Great Plains.
1809, name of a group of native peoples from the Plains states speaking a Siouan language, from Dakota dakhota "friendly" (the name often is translated as "allies"). Recorded by Lewis and Clark (1804) as Dar co tar; in western dialects of the Teton subgroup, Lakota, Lakhota; in Assiniboine dialect, Nakota,