social insurance number

English

Noun

social insurance number (plural social insurance numbers)

  1. (Canada) A nine-digit number issued by the government of Canada to citizens, permanent residents, and some categories of temporary residents, for official identification in the provision of government services and income taxation.
    Alternative form: SIN (initialism)
    Hypernyms: number, identifier
    Coordinate terms: SSN, social security number (US); NI number, national insurance number (UK)

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