I. ˌSocial Seˈcurity ˌNumber BrE AmE 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
II. SSN /ˌes es ˈen/ BrE AmE
abbreviation for Social Security Number