(UK, taxation) A number used in the administration of the national insurance or social security system, and also used as a de facto national identification number.
No comments yet — say something.
Add your own interpretation of "national insurance number".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.