/ Dictionary / Index S Social Security Act: Meaning and Definition of Find definitions for: So'cial Secu'rity Act" Pronunciation: [key] — U.S. Govt. U.S. Govt. a law passed in 1935 providing old-age retirement insurance, a federal-state program of unemployment compensation, and federal grants for state welfare programs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. social security Social Security Administration Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language