Breadcrumb Home > Dictionary > Index S SSA: Meaning and Definition of Find definitions for: SSA Pronunciation: [key] Social Security Act. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ssa (Thesaurus) SS SSAE ✖ Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language