national insurance number

noun

A number used in the administration of the national insurance or social security system, and also used as a de facto national identification number.

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Meanings

national insurance number1

nounnational insurance number (plural national insurance numbers)

plural national insurance numbers · alternative National Insurance number

  1. UKeconomicsA number used in the administration of the national insurance or social security system, and also used as a de facto national identification number.

National Insurance number2

nounNational Insurance number (plural National Insurance numbers)

plural National Insurance numbers

  1. Alternative letter-case form of national insurance number

Synonyms & antonyms

Also see
ni number
Cite this entry
APA

national insurance number. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/national%20insurance%20number

MLA

“national insurance number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/national%20insurance%20number. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “national insurance number,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/national%20insurance%20number.

Source: national insurance number on Wiktionary, CC BY-SA 4.0.