noun firmness of mind; stability not to be shaken.
2. proof ·adj used in proving or testing; as, a proof load, or proof charge.
3. proof ·adj being of a certain standard as to strength;
said of alcoholic liquors.
4. proof ·adj firm or successful in resisting; as, proof against harm; waterproof; bombproof.
5. proof ·noun a process for testing the accuracy of an operation performed. ·cf. prove, ·vt, 5.
6. proof ·vt armor of excellent or tried quality, and deemed impenetrable; properly, armor of proof.
7. proof ·noun a trial impression, as from type, taken for correction or examination;
called also proof sheet.
8. proof ·noun any effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
9. proof ·noun 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.
10. proof ·noun 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.