/ Dictionary / Index Y Yankton: Meaning and Definition of Find definitions for: Yank•ton Pronunciation: (yangk'tun), [key] — pl. -tons, -ton a member of one of two tribes of Dakota Indian people who inhabited the northern Great Plains in the 18th and 19th centuries. Cf. a town in SE South Dakota. 12,011. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Yankeeland Yanktonai Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language