social_security has definitions from the field of government
1
[ noun ] (government) social welfare program in the U.S.; includes old-age and survivors insurance and some unemployment insurance and old-age assistance

Used in print

(Public Papers of the Presidents of the U.S. D. D....)

These expenditures are estimated to be $ 12.1 billion , an increase of $ 187 million over 1960 , reflecting additional longevity pay of career personnel , more dependents , an increased number of men drawing proficiency pay , and social_security tax increases ( effective for the full year in 1961 compared with only 6 months in 1960 ) .

(Your Federal Income Tax. 1962 Edition (Revised to...)

An overpayment of income and social_security taxes entitles you to a refund unless you indicate on the return that the overpayment should be applied to your succeeding year 's estimated tax .

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