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adjective necessary pronunciation in British English /ˈnesəs(ə)ri/
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  1. 1
    essential or needed in order to do something, provide something, or make something happen
    I don’t want to be disturbed unless it’s absolutely necessary.
    necessary for: basic foods regarded as necessary for health
    necessary for: What type of clothing is necessary for survival at these altitudes?
    it is necessary for someone to do something: It was necessary for all students to register a week in advance.
    if necessary: I can take your place at the meeting tomorrow if necessary.
    as necessary: We’ll be adding more workers as necessary (=as they are needed).
  2. 2
    certain to happen or exist
    The necessary risks of medicines must be weighed against their benefits.

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