I. ˌSocial Seˈcurity ˌNumber abbreviation, SSN noun
a number that the US government gives to all working people so that they become part of the welfare system. There is a similar system in the UK, by which people are given a National Insurance Number. ⇒ FICA, social security

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II. SSN /ˌes es ˈen/
abbreviation for Social Security Number

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SSN
Attack Submarine (Nuclear Propulsion) 
Social Security Number

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S.S.N.
Standard shipping notice

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