| 1. | a former territory in the United States: divided into the states of North Dakota and South Dakota 1889. |
| 2. | North Dakota or South Dakota. |
| 3. | the Dakotas, North Dakota and South Dakota. |
| 4. | 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. |
| 5. | Santee (defs. 3, 4). |
| 6. | a Siouan language spoken by the Dakota and Assiniboin Indians. |