AskDefine | Define proof

Dictionary Definition

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


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]


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"

User Contributed Dictionary



From Latin probare, test


  • /pru:f/


  1. Any effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.
    • Edmund Spenser,
      For whatsoever mother wit or art Could work, he put in proof.
    • Ford,
      You shall have many proofs to show your skill.
    • Ure,
      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.
  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. A proof sheet; a trial impression, as from type, taken for correction or examination.
  6. : A process for testing the accuracy of an operation performed. Compare Prove, transitive verb, 5.
  7. : Armor of excellent or tried quality, and deemed impenetrable; properly, armor of proof.
  8. 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.


any effort, process, or operation designed to establish or discover a fact or truth
the degree of evidence which convinces the mind of any truth or fact, and produces belief
quality or state of having been proved or tried
firmness of mind
a proof sheet
process for testing the accuracy of an operation performed
armor of excellent or tried quality

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.


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


used in proving or testing
firm or successful in resisting
being of a certain standard as to strength

See also


  1. To proofread.

Extensive Definition

Proof may refer to:
In entertainment:
proof in Bengali: প্রমাণ
proof in Czech: Důkaz
proof in Danish: Bevis
proof in German: Proof
proof in Estonian: Proof
proof in Spanish: Prueba
proof in Esperanto: Pruvo
proof in Italian: Prova
proof in Hungarian: Bizonyítás
proof in Dutch: Proof
proof in Norwegian: Bevis
proof in Portuguese: Prova (desambiguação)
proof in Romanian: Dovadă
proof in Russian: Доказательство
proof in Simple English: Proof
proof in Slovak: Dôkaz
proof in Serbo-Croatian: Dokaz
proof in Finnish: Todistus
proof in Thai: พรูฟ

Synonyms, Antonyms and Related Words

Christophany, Ditto copy, Photostat, Satanophany, Xerox, Xerox copy, absolute indication, account, acid test, acquaintance, affirmation, airtight, ammunition, angelophany, announcement, appearance, argument, assay, attestation, authentication, avatar, backing, backing up, ballproof, basis for belief, bearing out, blank determination, blue, blue book, blueprint, body of evidence, bolstering, bombproof, briefing, bring out, brouillon, bulletin, bulletproof, burden of proof, burglarproof, buttressing, certification, chain of evidence, circumstantiation, clue, cold-type proof, color proof, communication, communique, computer proof, conclusive evidence, confirmation, contact print, corroboration, corroboratory evidence, corrosionproof, criterion, crucial test, crucible, damning evidence, dampproof, data, datum, deduction, deductive reasoning, demonstration, determination, directory, disclosure, discourse, discourse of reason, discursive reason, dispatch, dissemination, docimasy, document, documentation, embodiment, engrave, enlargement, enlightenment, epiphany, essay, establishment, evidence, evincement, exhibit, expression, fact, facts, factual information, familiarization, feeling out, fire-resisting, fireproof, first draft, flameproof, foolproof, fortification, foundry proof, galley, galley proof, gen, general information, get out, ground, grounds, grounds for belief, guidebook, handout, hard information, hectograph, hectograph copy, hermetic, holeproof, impenetrable, impervious, impervious to, impregnable, impress, impression, imprint, incarnation, incidental information, incontrovertible evidence, indication, indisputable evidence, induction, inductive reasoning, info, information, instruction, insulate, intelligence, ironclad proof, issue, item of evidence, kiteflying, knowledge, leakproof, light, logical thought, manifestation, mark, material grounds, materialization, measure, mention, message, mimeograph, mimeograph copy, multigraph, muniments, mute witness, negative, noiseproof, notice, notification, offprint, onus, onus probandi, ordeal, overprint, page proof, philosophy, photocopy, photograph, photostatic copy, piece of evidence, plate proof, pneumatophany, positive, premises, presentation, press proof, print, probation, progressive proof, promotional material, proof against, proof before letter, proof sheet, protective, prove, proving, proving out, publication, publicity, publish, pull, pull a proof, punctureproof, put out, put to bed, put to press, ratification, ratiocination, rationalism, rationality, rationalization, rationalizing, reason, reason to believe, reasonableness, reasoning, reinforcement, reissue, release, relevant fact, report, reprint, repro proof, resistant, revelation, revise, rough draft, rough sketch, run, run off, rustproof, settlement, shatterproof, shellproof, sidelight, sign, slip, sophistry, sounding out, soundproof, specious reasoning, stamp, standard, stat, statement, stone proof, strengthening, strike, strong, substantiation, support, supporting evidence, sure sign, sweet reason, symptom, tempered, test, test case, testament, testimonial, testimony, the dope, the goods, the know, the scoop, theophany, tight, token, touchstone, tough, transmission, trial, trial impression, try, undergirding, unmistakable sign, validation, vandyke, verification, waterproof, watertight, weatherproof, wherefore, white book, white paper, why, whyfor, witness, word
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