Breadcrumb Home > 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: ultimathule Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language