/ Dictionary / Index S S. Dak.: Meaning and Definition of Find definitions for: S. Dak. Pronunciation: [key] South Dakota. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. S.D.A. 'sdeath Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language