The Collaborative International Dictionary of English v.0.48:
Proof \Proof\, n. [OF. prove, proeve, F. preuve, fr. L. proba,
fr. probare to prove. See Prove.]
1. Any effort, process, or operation designed to establish or
discover a fact or truth; an act of testing; a test; a
For whatsoever mother wit or art
Could work, he put in proof. --Spenser.
You shall have many proofs to show your skill.
Formerly, a very rude mode of ascertaining the
strength of spirits was practiced, called the proof.
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.
Note: Properly speaking, proof is the effect or result of
evidence, evidence is the medium of proof. Cf.
3. 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.
4. Firmness of mind; stability not to be shaken.
5. (Print.) A trial impression, as from type, taken for
correction or examination; -- called also proof sheet.
6. (Math.) A process for testing the accuracy of an operation
performed. Cf. Prove, v. t., 5.
7. Armor of excellent or tried quality, and deemed
impenetrable; properly, armor of proof. [Obs.] --Shak.
Artist's proof, a very early proof impression of an
engraving, or the like; -- often distinguished by the
Proof reader, one who reads, and marks correction in,
proofs. See def. 5, above.
Syn: Testimony; evidence; reason; argument; trial;
demonstration. See Testimony.