Date: | 1200-1300 |

Language: | Old French |

Origin: | preuve, from Late Latin proba, from Latin probare; PROBE^{2} |

1 facts, information, documents etc that prove something is true

## evidence

[uncountable and countable]**proof of purchase/ownership/identity**

Do you have any proof of purchase? (=something to prove that you bought and paid for something)

**proof (that)**

Do you have any proof that this man stole your bag?

There is no proof that the document is authentic.

He's living proof (=his experience or life shows it is true) that footballers can still play at the highest level into their late thirties.

**proof positive**(=definite proof that cannot be doubted)

We received 800 applications last year, proof positive that the college is highly regarded by parents and students.

**burden/onus of proof**law (=used to say who has to show that something is true or not in a legal case)

The burden of proof lies on the defendant.

2 a copy of a piece of writing or a photograph that is checked carefully before the final printing is done :

## copy

[countable usually plural] technicalTCNCan you check these proofs?

3

## mathematics

[countable]a) HM a test in mathematics of whether a calculation is correct

b) HM a list of reasons that shows a theorem (=statement) in geometry to be true

4 used to say that you can only know whether something is good or bad after you have tried it

## the proof of the pudding (is in the eating)

5 a measurement of the strength of some types of alcoholic drink, especially spirits :

## alcohol

[uncountable]DFD70% proof vodka (=that contains 70% pure alcohol) British English

70 proof vodka (=that contains 35% pure alcohol) American English