[noncount] 1 : a program in which the government provides money to people who are unable to work because they are old, disabled, or unemployed 2 or Social Security : a program in the U.S. that requires workers to make regular payments to a government fund which is used to make payments to people who are unable to work because they are old, disabled, or retired
▪ Social Security benefits/tax — abbr. SS 3 or Social Security : money that is paid out through a social security program
▪ She is living on social security. ▪ He began collecting/receiving Social Security checks.