There's no absolute proof, but all the evidence suggests (that) he's guilty. I'm glad I had the forethought to make a copy of the letter, as proof of what had been promised.

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 is a fact, argument, or piece of evidence which shows that something is definitely true or definitely exists. This is not necessarily proof that he is wrong.

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.

to treat or coat for the purpose of rendering resistant to deterioration, damage, etc. (often used in combination): to proof a house against termites; to shrink-proof a shirt.

Feb 10, 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.

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

Proof definition: The evidence or argument that compels the mind to accept an assertion as true.

PROOF definition: evidence sufficient to establish a thing as true, or to produce belief in its truth. See examples of proof used in a sentence.

verb (with object) 1. make (fabric) waterproof if you are using a piece of lightweight canvas it will be necessary to proof the fabric when complete 2. make a proof of (a printed work, engraving, etc.) …