Yankton Syllabification: (Yank·ton)Pronunciation: /ˈyaNGktən/Definition of Yankton noun (plural same or Yanktons) 1a member of an American Indian people of the Great Plains of North and South Dakota. 2the Siouan language of the Yankton. adjective relating to the Yankton or their language. Origin:from Sioux ihãkthũwã, literally 'those dwelling at the end'
