- 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. See related entries: Experiments and research - 2[uncountable] the process of testing whether something is true or a fact Is the claim capable of proof? see also burden of proof See related entries: Experiments and research
- 3 [countable] (mathematics) a way of proving that a statement is true or that what you have calculated is correct See related entries: Mathematical terminology
- 4[countable, usually plural] a copy of printed material which is produced so that mistakes can be corrected She was checking the proofs of her latest novel.
- 5[uncountable] a standard used to measure the strength of alcoholic drinks Word OriginMiddle English preve, from Old French proeve, from late Latin proba, from Latin probare ‘to test, prove’. The change of vowel in late Middle English was due to the influence of prove. Current senses of the verb date from the late 19th cent.Word Familyprove verb (≠disprove)proof nounproven adjective (≠unproven)Extra examples Have you got any positive proof that she took the money? He is unlikely to make wild accusations without proof. Her account gives us no concrete proof of his guilt. I am living proof that the treatment works. I have no real proof that he was at the flat. I have no real proof that he was in the country at the time. Proof of purchase must be provided before a refund can be made. The burden of proof lay on the plaintiff to prove negligence. The lungfish is living proof that fish could evolve to breathe on land. The men were acquitted for lack of proof. The photo was final proof of her husband’s infidelity. We have proof positive that he is in hiding. Can you provide any proof of identity? Keep the receipt as proof of purchase. We need conclusive proof before we can take this matter to court.Idioms

noun
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BrE BrE//pruːf//; NAmE NAmE//pruːf//

Experiments and research, Mathematical terminologyto 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.

(saying) you can only judge if something is good or bad when you have tried it

Check pronunciation: proof