Meaning of “proof” in the English Dictionary

"proof" in British English

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uk /pruːf/ 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 your receipt as proof of purchase.

More examples

proofadjective [ after noun ]

uk /pruːf/ us /pruːf/

proofverb [ T ]

uk /pruːf/ us /pruːf/


uk / -pruːf/ us / -pruːf/

(Definition of “proof” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"proof" in American English

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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 printed copy of written material that is examined and corrected before final copies 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 mathematical problem or equation was reached

proof noun (AMOUNT OF ALCOHOL)

[ U, not gradable ] a measure of the percentage of alcohol in an alcoholic drink, equal to twice the actual percentage 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 /pruːf/ us also proof copy

a printed copy of something that is examined and corrected before the final copies 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)