/ Dictionary / Index S Sioux City: Meaning and Definition of Find definitions for: Sioux' Cit'y Pronunciation: [key] a port in W Iowa, on the Missouri River. 82,003. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sioux Sioux Falls Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language