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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 logical…. Learn more.

evidence, proof - Evidence—from Latin e-, "out," and videre, "to see"— is information that helps form a conclusion; proof is factual information that verifies a conclusion.

Definition of proof noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Proof is a fact, argument, or piece of evidence showing that something is definitely true or definitely exists. This is not necessarily proof that he is wrong. You have to have proof of residence in the state …

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Jan 20, 2026 · proof (countable and uncountable, plural proofs) (countable) An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.

-PROOF definition: a combining form meaning “resistant, impervious to” that specified by the initial element. See examples of -proof used in a sentence.

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