proof Meaning in the Cambridge English Dictionary Cambridge dictionaries logo

Meaning of “proof” in the English Dictionary

"proof" in British English

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proofnoun

uk   us   /pruːf/
  • proof noun (SHOWING TRUTH)

B2 [C or U] a ​fact or ​piece of ​information that ​shows that something ​exists or is ​true: [+ that] Do they have any proof that it was Hampson who ​stole the ​goods? I have a ​suspicion that he's having an ​affair, though I don't have any concrete (= ​definite) proof. If anyone ​needs proof of Andrew Davies' ​genius as a ​writer, this ​novel is it. "How ​old are you?" "21." "Do you have any proof on you?" Keep ​yourreceipt as proof ofpurchase.

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proofadjective [after noun]

uk   us   /pruːf/

proofverb [T]

uk   us   /pruːf/

-proofsuffix

uk   us   /-pruːf/
(Definition of proof from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"proof" in American English

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proofnoun

 us   /pruf/
  • proof noun (FACTS)

[U] facts or ​documents that can be used to show that something is ​true: You will need to have proof of ​citizenship in ​order to get a ​passport.
  • proof noun (PRINTED COPY)

[C] a ​printedcopy of written ​material that is ​examined and corrected before ​finalcopies are ​printed: Page proofs went out ​yesterday to all the ​contributors to the ​book.
  • proof noun (CALCULATION)

mathematics [C] the calculations that show how the ​solution to a ​mathematicalproblem or ​equation was ​reached
  • proof noun (AMOUNT OF ALCOHOL)

[U, not gradable] a ​measure of the ​percentage of ​alcohol in an ​alcoholicdrink, ​equal to ​twice the ​actualpercentage of ​alcohol: Liquor that is 50 proof is 25% ​alcohol.
(Definition of proof from the Cambridge Academic Content Dictionary © Cambridge University Press)

"proof" in Business English

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proofnoun [C usually plural]

uk   us   /pruːf/ (also proof copy)
a ​printedcopy of something that is ​examined and ​corrected before the ​finalcopies are ​printed: We still had ​time to ​correct the proofs of the ​brochure.
(Definition of proof from the Cambridge Business English Dictionary © Cambridge University Press)
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