Proof - definition, pronunciation, transcription

Amer.  |pruːf|  American pronunciation of the word proof
Brit.  |pruːf|  British pronunciation of the word proof


- any factual evidence that helps to establish the truth of something
if you have any proof for what you say, now is the time to produce it
- a formal series of statements showing that if one thing is true something else necessarily follows from it
- a measure of alcoholic strength expressed as an integer twice the percentage of alcohol present (by volume)
- (printing) an impression made to check for errors
- a trial photographic print from a negative
- the act of validating; finding or testing the truth of something (syn: substantiation, validation)


- make or take a proof of, such as a photographic negative, an etching, or typeset
- knead to reach proper lightness
proof dough
- read for errors (syn: proofread)
I should proofread my manuscripts
- activate by mixing with water and sometimes sugar or milk
proof yeast
- make resistant (to harm)
proof the materials against shrinking in the dryer


- (used in combination or as a suffix) able to withstand
childproof locks

Extra examples

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 proof shows that the theorem is true.

She proofed the story carefully.

These suspicions are confirmed by the most direct proof.

A dressing-gown is no proof against draughts.

This latest interview was further proof of how good at her job Cara was.

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

You'll need your passport as proof of identity.

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

There is no proof that the document is authentic.

Laboratory tests gave conclusive proof that the meat presents no risk to human health.

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.

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

The burden of proof lies on the defendant.

Word forms

I/you/we/they: proof
he/she/it: proofs
present participle: proofing
past tense: proofed
past participle: proofed
singular: proof
plural: proofs
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