1. a member of the Siouan people of the northern Mississippi valley; commonly called the Sioux;
2. the area of the states of North Dakota and South Dakota;
3. the Siouan language spoken by the Dakota;
WordNet (r) 3.0 (2006):
Dakota
n 1: a member of the Siouan people of the northern Mississippi
valley; commonly called the Sioux
2: the area of the states of North Dakota and South Dakota
3: the Siouan language spoken by the Dakota