1 /pru:f/ noun
1 (C, U) facts, information, documents etc that prove something is true
(+ of): Bring a passport as proof of identity. (+ (that)): Do you have any proof that this man stole your bag? | conclusive proof (=that cannot be doubted) | proof positive (=definite proof)
2 (C) technical a printed copy of a piece of writing used to find and remove mistakes before the final printing is done: Can you check these proofs?
3 (C) a photograph that is used as a test copy before an official copy is made
4 (C)
a) a test in mathematics of the correctness of a calculation
b) a list of reasons that shows a theorem (=statement) in geometry to be true
6 the proof of the pudding (is in the eating) used to say that you can only know whether something is good or bad after you have tried it
7 (U) technical the standard strength of some kinds of alcoholic drink compared with that of proof spirit: This gin is 15% under proof.
8 put sth to the proof to test the quality or strength of something
2 adjective
1 waterproof/bulletproof etc something that is waterproof etc will not let water etc through it or into it: a soundproof room
2 child-proof/vandal-proof not easily affected or damaged by someone or something: a child-proof latch on the cupboard
3 be proof against to be too strong or good to be affected by something bad: a faith that is proof against temptation
4 30% proof/40% proof etc BrE, also 30 proof/40 proof etc AmE whisky, bourbon etc that has a particular proof contains a specific amount of alcohol
3 verb (transitive usually passive) to treat a material with a substance in order to protect it against water, oil etc (+ against): climbing gear proofed against water

Longman dictionary of contemporary English. 2004.

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