/ Dictionary / Index S SSR: Meaning and Definition of Find definitions for: SSR Pronunciation: [key] Soviet Socialist Republic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. SSPE SSS Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language