proof

What is the Definition of proof?

Noun:

any factual evidence that helps to establish the truth of something
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)
a trial photographic print from a negative
the act of validating; finding or testing the truth of something

Verb:

make or take a proof of, such as a photographic negative, an etching, or typeset
knead to reach proper lightness
read for errors
activate by mixing with water and sometimes sugar or milk
make resistant (to harm)

Adjective:

Anyway, we have never had any proof Snape found out how to get past Fluffy.

Scientific proof supports the theory of evolution. - Научное доказательство подтверждает теорию эволюции.

But we have got no proof! said Harry.

The proof is in the results. - Доказательство — в результатах.