American English

Definition of proof noun from the Oxford Advanced American Dictionary



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  1. 1[uncountable, countable] information, documents, etc. that show that something is true synonym evidence positive/conclusive proof proof of something Can you provide any proof of identity? Keep the receipt as proof of purchase. These results are a further proof of his outstanding ability. proof that… There is no proof that the knife belonged to her.
  2. 2[uncountable] the process of testing whether something is true or a fact IWhat is the method of proof? see also burden of proof
  3. 3[countable] (mathematics) a way of proving that a statement is true or that what you have calculated is correct
  4. 4[countable, usually plural] a copy of printed material that is produced so that mistakes can be corrected She was checking the proofs of her latest novel.
  5. 5[uncountable] a standard used to measure the strength of alcoholic drinks
  6. Word Familyprove verb (disprove)proof nounproven adjective (unproven)Idioms
    be living proof of something/that…
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    to show by your actions or qualities that a particular fact is true These figures are living proof of the government's incompetence. He is living proof that not all engineers are boring.
    the proof of the pudding (is in the eating) (saying)
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    you can only judge if something is good or bad when you have tried it
See the Oxford Advanced Learner's Dictionary entry: proof