noun
1. : the principle or practice of public provision for the economic security and social welfare of the individual and his family (as through social insurance or assistance)
2.
a. sometimes capitalized : a United States government program established in 1935, gradually extended since, and including provisions for old age and survivors insurance, contributions to state unemployment insurance, and old age assistance
b. : a deduction or payment made under the United States social security program
deducted three dollars from his check for social security
hasn't received his social security for this month