Definitions from Wiktionary (social security number)

▸ noun:  (US) A nine-digit number issued to citizens, permanent residents, and temporary (working) residents by the Social Security Administration under section 205(c)(2) of the Social Security Act, codified as 42 U.S.C. § 405(c)(2), introduced primarily to track people for taxation purposes, and in recent years serving as a de facto national identification number.
▸ noun:  A corresponding number in other countries.




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