Definition of Social Security number noun from the Oxford Advanced Learner's Dictionary


Social Security number

; NAmE
(abbreviation SSN)
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(in the US) an official identity number that everyone is given when they are born Culture The SSN was originally a qualification for work and social security, but in 1987 the US government decided that children should also be given numbers. The number is now also used in other ways, e.g. on bank cheques and driving licences (= documents that allow people to drive) and as a student's number at college or university.
See the Oxford Advanced American Dictionary entry: Social Security number