Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “proof”

proof

noun uk   /pruːf/ us  

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.

proof noun (PRINTED COPY)

[C] a printed copy of something that is examined and corrected before the final copies are printed: I was busy correcting proofs.

proof

adjective [after noun] uk   /pruːf/ us  

proof adjective [after noun] (ALCOHOL)

of the stated alcoholic strength, a higher number meaning a greater amount of alcohol: It says on the bottle that it's 60 percent proof.

proof adjective [after noun] (PROTECTED)

formal providing protection against something: No household security devices are proof against (= protect completely against) the determined burglar. Her virtue would be proof against his charms.

proof

verb [T] uk   /pruːf/ us  
to treat a surface with a substance that will protect it against something, especially water
(Definition of proof noun, adjective, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of proof?
Add Cambridge dictionaries to your browser to your website

Definitions of “proof” in other dictionaries

Word of the Day

monster

any imaginary frightening creature, especially one that is large and strange

Word of the Day

What’s that lovely smell?

by Kate Woodford,
October 29, 2014
As adult humans, we can distinguish about 10,000 different smells. It’s no wonder, then, that we have so many words and expressions to describe them. This week we’re taking a look at those smell words – words that describe good smells and words that describe bad smells. Most smell words are either

Read More 

high-frequency trading noun

October 27, 2014
a type of stock market trading that uses very complex technology to trade extremely quickly, often making tiny profits which nevertheless add up to substantial sums Lewis’s book, Flash Boys, is driving a huge amount of attention toward the topic of high frequency trading, and it has rekindled some of

Read More