1proof 
/ˈpru:f/ noun
plural proofs /ˈpru:f/ noun 1 [noncount] : something which shows that something else is true or correct
▪ The document was proof that her story was true. ▪ He claims that he was home when the murder was committed, but he has no proof. ▪ The photograph is proof positive [=definite proof] that the accident happened the way he described. ▪ I'm living proof that success is possible. [=my success shows that other people can succeed too] — often + of ▪ The evidence gave proof of her statement. [=the evidence proved her statement] ▪ Do you have any proof of identity? ▪ Keep the receipt as proof of purchase. [=evidence showing/proving that you bought something] 2 [count] a : an act or process of showing that something is true
▪ The burden of proof [=the need to show that something is true] is on the prosecuting lawyer of the case.
b mathematics : a test which shows that a calculation is correct
▪ The proof shows that the theorem is true. ▪ mathematical proofs 3 [count] technical : a copy of something that is going to be printed which is examined and used to make corrections before the final printing is done — usually plural ▪ He edited the proofs of the manuscript. 4 [noncount] : a measurement of how much alcohol is in an alcoholic drink
▪ The whiskey is 80 proof.
▪ The document was proof that her story was true. ▪ He claims that he was home when the murder was committed, but he has no proof. ▪ The photograph is proof positive [=definite proof] that the accident happened the way he described. ▪ I'm living proof that success is possible. [=my success shows that other people can succeed too] — often + of ▪ The evidence gave proof of her statement. [=the evidence proved her statement] ▪ Do you have any proof of identity? ▪ Keep the receipt as proof of purchase. [=evidence showing/proving that you bought something]
▪ The burden of proof [=the need to show that something is true] is on the prosecuting lawyer of the case.
b mathematics : a test which shows that a calculation is correct
▪ The proof shows that the theorem is true. ▪ mathematical proofs
▪ The whiskey is 80 proof.
the proof is in the pudding — see pudding
