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See also -proof, prof, and Prof.


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From Latin probare, test





proof ({{{1}}})
  1. Any effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
  2. The degree of evidence which convinces the mind of any truth or fact, and produces belief; a test by facts or arguments which induce, or tend to induce, certainty of the judgment; conclusive evidence; demonstration.
  3. The quality or state of having been proved or tried; firmness or hardness which resists impression, or doesn't yield to force; impenetrability of physical bodies.
  4. Firmness of mind; stability not to be shaken.
  5. (printing) A proof sheet; a trial impression, as from type, taken for correction or examination.
  6. (mathematics): A process for testing the accuracy of an operation performed. Compare Prove, transitive verb, 5.
  7. (obsolete): Armour of excellent or tried quality, and deemed impenetrable; properly, armour of proof.
  8. (US) A measure of the alcohol content of liquor. Originally, in Britain, 100 proof was defined as 57.1% by volume (not used anymore). In the US, 100 proof means that the alcohol content is 50% of the total volume of the liquid, and thus, absolute alcohol would be 200 proof.


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Derived terms

  • 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.




proof (comparative {{{1}}}, superlative {{{2}}})




  1. Used in proving or testing; as, a proof load, or proofcharge.
  2. Firm or successful in resisting; as, proof against harm; waterproof; bombproof.
    I ... have found thee Proof against all temptation. -w:Milton.
    This was a good, stout proof article of faith. -w:Burke.
  3. Being of a certain standard as to strength; -- said of alcoholic liquors.

Derived terms

  • proof charge (Firearms), a charge of powder and ball, greater than the service charge, fired in an arm, as a gun or cannon, to test its strength.
  • proof impression See under impression.
  • proof load (Engineering), the greatest load than can be applied to a piece, as a beam, column, etc., without straining the piece beyond the elastic limit.
  • proof sheet See Proof, n., 5.
  • proof (spirits) (chemistry), a strong distilled liquor, or mixture of alcohol and water, containing not less than a standard amount of alcohol.
    In the United States proof spirit is defined by law to be that mixture of alcohol and water which contains one half of its volume of alcohol, the alcohol when at a temperature of 60 deg. Fahrenheit being of specific gravity 0.7939 referred to water at its maximum density as unity. Proof spirit has at 15.556 deg. Celsius, a specific gravity of 0.93353, 100 parts by volume of the same consisting of 50 parts of absolute alcohol and 53.71 parts of water, the apparent excess of water being due to contraction of the liquids on mixture.
    In England proof spirit is defined by Act 58, George III., to be such as shall at a temperature of 10,556 deg. Celsius, weigh exactly the 12/13 part of an equal measure of distilled water. This contains 49.3 per cent by weight, or 57.09 by volume, of alcohol. Stronger spirits, as those of about 60, 70, and 80 per cent of alcohol, are sometimes called second, third, and fourth proof spirits respectively.
  • proof staff a straight-edge used by millers to test the flatness of a stone.
  • proof stick (Sugar Manufacturing), a rod in the side of a vacuum pan, for testing the consistency of the syrup.
  • proof text a passage of Scripture used to prove a doctrine.


See also


to proof

Third person singular

Simple past

Past participle

Present participle

to proof (third-person singular simple present -, present participle -, simple past and past participle -)
  1. (colloquial) To proofread.

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