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proof

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noun British English pronunciation: proof /pruːf/ 
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singularproof
pluralproofs
 
  1. 1
    [countable/uncountable] information or evidence that shows that something is definitely true or definitely exists
    proof of:

    We were unable to establish proof of her innocence.

    Do you have any proof of identity (=a document such as a passport that proves who you are)?

    proof that:

    Do you have any proof that this is true?

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