1. Any effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial. For whatsoever mother wit or art Could work, he put in proof. (Spenser) You shall have many proofs to show your skill. (Ford) Formerly, a very rude mode of ascertaining the strength of spirits was practiced, called the proof. (ure)
2. That degree of evidence which convinces the mind of any truth or fact, and produces belief; a test by facts or arguments that induce, or tend to induce, certainty of the judgment; conclusive evidence; demonstration. I'll have some proof. (Shak) It is no proof of a man's understanding to be able to confirm whatever he pleases. (Emerson)
7. Armor of excellent or tried qualit 6f1 y, and deemed impenetrable; properly, armor of proof. Artist's proof, a very early proof impression of an engraving, or the like; often distinguished by the artist's signature. Proof reader, one who reads, and marks correction in, proofs. See def. 5, above.
Origin: OF. Prove, proeve, F. Preuve, fr. L. Proba, fr. Probare to prove. See Prove.