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.

P. Oxy. 29, one of the oldest surviving fragments of Euclid 's Elements, a textbook used for millennia to teach proof-writing techniques. The diagram accompanies Book II, Proposition 5. …

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

Nov 1, 2025 · (countable, logic, mathematics) A sequence of statements consisting of axioms, assumptions, statements already demonstrated in another proof, and statements that logically …

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.

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 …

In the majority of cases, prove is a verb, while proof is a noun. There are rare exceptions to this rule, but they should be avoided in formal writing.

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.

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.

proof is a borrowing from French. Etymons: French prove, preuve.