/ Dictionary / Index S Sisseton: Meaning and Definition of Find definitions for: Sis•se•ton Pronunciation: (sis'i-tun, -tn), [key] — pl. -tons, -ton. a member of a North American Indian people belonging to the Santee branch of the Dakota. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sismondi sissified Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language