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nounSynonym of national insurance number.
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APA
NI number. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/NI%20number
MLA
“NI number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/NI%20number. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “NI number,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/NI%20number.
Source: NI number on Wiktionary, CC BY-SA 4.0.