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National Insurance number
Na·tion·al In·sur·ance num·ber (plural Na·tion·al In·sur·ance num·bers)


noun 
Definition:
 
individual's reference number: in the United Kingdom, a unique reference number assigned to each person within the state insurance system. It remains the same throughout each person's life.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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