proof (pr
f)
n.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. Convincing or persuasive demonstration: was asked for proof of his identity; an employment history that was proof of her dependability.
b. The state of being convinced or persuaded by consideration of evidence.
4. Determination of the quality of something by testing; trial: put one's beliefs to the proof.
5. Law The result or effect of evidence; the establishment or denial of a fact by evidence.
6. The alcoholic strength of a liquor, expressed by a number that is twice the percentage by volume of alcohol present.
7. Printing a. A trial sheet of printed material that is made to be checked and corrected. Also called
proof sheet.
b. A trial impression of a plate, stone, or block taken at any of various stages in engraving.
8. a. A trial photographic print.
b. Any of a limited number of newly minted coins or medals struck as specimens and for collectors from a new die on a polished planchet.
9. Archaic Proven impenetrability: "I was clothed in Armor of proof" (John Bunyan).