Breadcrumb Home > Dictionary > Index S Sioux: Meaning and Definition of Find definitions for: Sioux Pronunciation: (s), [key] — pl. Sioux Dakota (defs. 4, 6). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sioux (Thesaurus) Siouan Sioux City TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: bildungsroman Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language