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national insurance number

(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.

ˈnæʃənəl ɪnˈʃʊɹəns ˈnʌmbɚ166 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 27, 2026UK

(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.

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