Breadcrumb Home > Dictionary > Index S Supplemental Security Income: Meaning and Definition of Find definitions for: Supplemen'tal Secu'rity In"come Pronunciation: [key] income provided by the U.S. government to needy aged, blind, and disabled persons. Abbr.: SSI Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. supplemental plumage supplementary TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: nosegay Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language