Source : Webster's Revised Unabridged Dictionary (1913)

Proof \Proof\, a.
   1. Used in proving or testing; as, a proof load, or proof
      charge.

   2. Firm or successful in resisting; as, proof against harm;
      waterproof; bombproof.

            I . . . have found thee Proof against all
            temptation.                           --Milton.

            This was a good, stout proof article of faith.
                                                  --Burke.

   3. Being of a certain standard as to strength; -- said of
      alcoholic liquors.

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
      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.

   Note: Properly speaking, proof is the effect or result of
         evidence, evidence is the medium of proof. Cf.
         {Demonstration}, 1.

   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
      artist's signature.

   {Proof reader}, one who reads, and marks correction in,
      proofs. See def. 5, above.

   Syn: Testimony; evidence; reason; argument; trial;
        demonstration. See {Testimony}.

Source : WordNet®

proof
     adj : (used in combination or as a suffix) able to withstand;
           "temptation-proof"; "childproof locks" [syn: {proof(p)}]

proof
     n 1: any factual evidence that helps to establish the truth of
          something; "if you have any proof for what you say, now
          is the time to produce it" [syn: {cogent evidence}]
     2: a formal series of statements showing that if one thing is
        true something else necessarily follows from it
     3: a measure of alcoholic strength expressed as an integer
        twice the percentage of alcohol present (by volume)
     4: (printing) an impression made to check for errors [syn: {test
        copy}, {trial impression}]
     5: a trial photographic print from a negative
     6: the act of validating; finding or testing the truth of
        something [syn: {validation}, {substantiation}]

proof
     v 1: make or take a proof of, such as a photographic negative, an
          etching, or typeset
     2: knead to reach proper lightness; "proof dough"
     3: read for errors; "I should proofread my manuscripts" [syn: {proofread}]
     4: activate by mixing with water and sometimes sugar or milk;
        "proof yeast"
     5: make resistant to water, sound, errors, etc.; "proof the
        materials against shrinking in the dryer"

Source : Free On-Line Dictionary of Computing

proof
     
        1.  A {finite} sequence of {well-formed formula}s, F1,
        F2, ... Fn, where each Fi either is an {axiom}, or follows by
        some rule of inference from some of the previous F's, and Fn
        is the statement being proved.
     
        See also {proof theory}.
     
        2. A left-associative {natural language} {parser} by Craig
        R. Latta .  Ported to {Decstation
        3100}, {Sun-4}.
     
        {(ftp://scam.berkeley.edu/pub/src/local/proof/)}.
     
        E-mail: .  Mailing list:
        [email protected] (Subject: add me).
     
        (1994-11-29)