/ Dictionary / Index S South Dakota: Meaning and Definition of Find definitions for: South' Dako'ta Pronunciation: [key] a state in the N central United States: a part of the Midwest. 690,178; 77,047 sq. mi. (199,550 sq. km). Cap.: Pierre. Abbr.: SD (for use with zip code), S. Dak. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. South China Sea Southdown Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language