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  1. Definition of proof. as in evidence. something presented in support of the truth or accuracy of a claim she presented proof that she had not cheated. Synonyms & Similar Words. Relevance. evidence. testimony. documentation. testament. testimonial. confirmation. witness. validation. corroboration. substantiation. attestation. document. voucher.

  2. a fact or a piece of information that shows something exists or is true: She showed us her passport as proof of her identity. [ + (that) ] My landlord has asked for proof that I'm employed. Fewer examples. There was no absolute proof of fraud. In the absence of any proof, it is impossible to accuse her.

  3. to show by your actions or qualities that a particular fact is true. These figures are living proof of the government's incompetence. He is living proof that age is no barrier to new challenges. the proof of the pudding (is in the eating) (saying) you can only judge if something is good or bad when you have tried it.

  4. 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.

  5. 1. The evidence or argument that compels the mind to accept an assertion as true. 2. a. The validation of a proposition by application of specified rules, as of induction or deduction, to assumptions, axioms, and sequentially derived conclusions. b. A statement or argument used in such a validation. 3. a.

  6. 5 days ago · 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. I would need to bring in something with my French address on it as proof of residence. [ + of] Economists have been concerned with establishing proofs for their arguments.

  7. [ uncountable] evidence or facts that are sufficient to establish a thing as true or believable. Mathematics, Philosophy [ countable]a sequence of steps, statements, or demonstrations that leads to and establishes a valid conclusion.

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