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The meaning of PROOF is the cogency of evidence that compels acceptance by the mind of a truth or a fact. How to use proof in a sentence.

PROOF definition: 1. a fact or piece of information that shows that something exists or is true: 2. a printed copy…. Learn more.

What proof do you have? to put a thing to the proof. the establishment of the truth of anything; demonstration. Law. (in judicial proceedings) evidence having probative weight. the effect of …

Proof is the evidence that shows something is true or valid. When you show the logical steps that take you from your hypothesis that the world is round to the conclusion that it is, you're formulating a proof.