supplemental security income
Supplemental Security Income. A welfare or needs-based program providing monthly income to the aged, blind, or disabled. • It is authorized by the Social Security Act. — Abbr. SSI. [Cases: Social Security and Public Welfare 135, 140.5, 175. C.J.S. Social Security and Public Welfare §§ 36–38, 42, 48–49, 58–59, 61, 95.]