any effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.-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.-the quality or state of having been proved or tried; firmness or hardness that resists impression, or does not yield to force; impenetrability of physical bodies.-firmness of mind; stability not to be shaken.-a trial impression, as from type, taken for correction or examination; -- called also proof sheet.-a process for testing the accuracy of an operation performed.  cf. prove, v. t., 5.-armor of excellent or tried quality, and deemed impenetrable; properly, armor of proof.-used in proving or testing; as, a proof load, or proof charge.-firm or successful in resisting; as, proof against harm; waterproof; bombproof.-being of a certain standard as to strength; -- said of alcoholic liquors.