What does proof mean?

Definitions for proof

This dictionary definitions page includes all the possible meanings, example usage and translations of the word proof.

Princeton's WordNet

  1. proof, cogent evidencenoun

    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"

  2. proofnoun

    a formal series of statements showing that if one thing is true something else necessarily follows from it

  3. proofnoun

    a measure of alcoholic strength expressed as an integer twice the percentage of alcohol present (by volume)

  4. proof, test copy, trial impressionnoun

    (printing) an impression made to check for errors

  5. proofnoun

    a trial photographic print from a negative

  6. validation, proof, substantiationadjective

    the act of validating; finding or testing the truth of something

  7. proof(p)verb

    (used in combination or as a suffix) able to withstand

    "temptation-proof"; "childproof locks"

  8. proofverb

    make or take a proof of, such as a photographic negative, an etching, or typeset

  9. proofverb

    knead to reach proper lightness

    "proof dough"

  10. proofread, proofverb

    read for errors

    "I should proofread my manuscripts"

  11. proofverb

    activate by mixing with water and sometimes sugar or milk

    "proof yeast"

  12. proofverb

    make resistant (to harm)

    "proof the materials against shrinking in the dryer"


  1. proofnoun

    An effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial.

  2. proofnoun

    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. proofnoun

    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. proofnoun

    Experience of something.

  5. proofnoun

    Firmness of mind; stability not to be shaken.

  6. proofnoun

    A proof sheet; a trial impression, as from type, taken for correction or examination.

  7. proofnoun

    A sequence of statements consisting of axioms, assumptions, statements already demonstrated in another proof, and statements that logically follow from previous statements in the sequence, and which concludes with a statement that is the object of the proof.

  8. proofnoun

    A process for testing the accuracy of an operation performed. Compare prove, transitive verb, 5.

  9. proofnoun

    Armour of excellent or tried quality, and deemed impenetrable; properly, armour of proof.

  10. proofverb

    To proofread.

  11. proofverb

    To make resistant, especially to water.

  12. proofverb

    To knead, as in bread dough.

  13. proofnoun

    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.

  14. proofadjective

    Used in proving or testing.

    a proof load; a proof charge

  15. proofadjective

    Firm or successful in resisting.

  16. proofadjective

    Being of a certain standard as to alcohol content.

  17. Etymology: From proof, from prove, from proba, from probare; see prove.

Samuel Johnson's Dictionary

  1. Prief

    for proof.

    Edmund Spenser.

  2. Proofadjective

    This word, though used as an adjective, is only elliptically put for of proof.

    Now put your shields before your hearts, and fight
    With hearts more proof than shields. William Shakespeare.

    Opportunity I here have had
    To try thee, sift thee, and confess have found thee
    Proof against all temptation, as a rock
    Of adamant. John Milton, Par. Regain’d.

    He past expression lov’d,
    Proof to disdain, and not to be remov’d. Dryden.

    When the mind is throughly tinctured, the man will be proof against all oppositions. Collier.

    Guiltless of hate, and proof against desire;
    That all things weighs, and nothing can admire. Dryden.

    When a capuchin, that was thought proof against bribes, had undertaken to carry on the work, he died a little after. Addison.

    Imagin’d wise,
    Constant, mature, proof against all assaults. John Milton.

    Deep in the snowy Alps, a lump of ice
    By frost was harden’d to a mighty price;
    Proof to the sun it now securely lies,
    And the warm dog-star’s hottest rage defies. Addison.

    The God of day,
    To make him proof against the burning ray,
    His temples with celestial ointment wet. Addison.

  3. Proofnoun

    Etymology: from prove.

    That they all have always so testified, I see not how we should possibly wish a proof more palpable than this. Richard Hooker.

    This has neither evidence of truth, nor proof sufficient to give it warrant. Richard Hooker.

    Though the manner of their trials should be altered, yet the proof of every thing must needs be by the testimony of such persons as the parties shall produce. Edmund Spenser.

    That which I shall report will bear no credit,
    Were not the proof so high. William Shakespeare.

    One soul in both, whereof good proof
    This day affords. John Milton.

    This, vers’d in death, th’ infernal knight relates,
    And then for proof fulfill’d their common fates. Dryden.

    Those intervening ideas, which serve to shew the agreement of any two others, are called proofs. John Locke.

    Retire or taste thy folly, and learn by proof,
    Hell-born! not to contend with spirits of heav’n. John Milton.

    This day to Dagon is a solemn feast,
    Thy strength they know surpassing human race,
    And now some publick proof thereof require
    To honour this great feast. John Milton, Agonistes.

    When the imagination hath contrived the frame of such an instrument, and conceives that the event must infallibly answer its hopes, yet then does it strangely deceive in the proof. John Wilkins, Math. Magick.

    Gave, while he taught, and edify’d the more,
    Because he shew’d, by proof, ’twas easy to be poor. Dryd.

    My paper gives a timorous writer an opportunity of putting his abilities to the proof. Addison.

    Here for ever must I stay,
    Sad proof how well a lover can obey. Alexander Pope.

    Add proof unto mine armour with thy prayers,
    And with thy blessings steel my lance’s point. William Shakespeare.

    To me the cries of fighting fields are charms,
    Keen be my sabre, and of proof my arms;
    I ask no other blessing of my stars. Dryden.

    With arms of proof, both for myself and thee,
    Chuse thou the best. Dryden.

    He Bellona’s bridegroom, lapt in proof,
    Confronted him. William Shakespeare, Macbeth.


  1. Proof

    Proof is a song by English band I Am Kloot. A demo version of "Proof" was released in 2001 as a B-side on the single "Morning Rain" from the album Natural History. This version is also included on the compilation album B from 2009. In 2003, the song appeared on I Am Kloot's self-titled second album. Even after the making of a video for "Proof" (by Krishna Stott, featuring Christopher Eccleston), their then record label, Echo, subsequently shelved the release of the single. "Proof" was released on 21 June 2004 as a download-only single, but it did not receive its intended, full release. Finally, in 2010, a remodelling of the song was produced for their fifth studio album, Mercury nominated Sky at Night. This new version of "Proof" was released as a download-only single on 6 September 2010 – the second single, following "Northern Skies". The 2010 video for "Proof" (the old video with the new audio) was also released in September 2010.


  1. proof

    A proof is a logical or mathematical demonstration confirming the validity of a proposition, statement, or theory by presenting a structured set of reasons or evidence. It's a convincing way of establishing truth by following a series of logical steps from a starting point of agreed upon facts known as axioms, assumptions or premises.

Webster Dictionary

  1. Proofnoun

    any effort, process, or operation designed to establish or discover a fact or truth; an act of testing; a test; a trial

  2. Proofnoun

    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. Proofnoun

    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. Proofnoun

    firmness of mind; stability not to be shaken

  5. Proofnoun

    a trial impression, as from type, taken for correction or examination; -- called also proof sheet

  6. Proofnoun

    a process for testing the accuracy of an operation performed. Cf. Prove, v. t., 5

  7. Proofverb

    armor of excellent or tried quality, and deemed impenetrable; properly, armor of proof

  8. Proofadjective

    used in proving or testing; as, a proof load, or proof charge

  9. Proofadjective

    firm or successful in resisting; as, proof against harm; waterproof; bombproof

  10. Proofadjective

    being of a certain standard as to strength; -- said of alcoholic liquors

Chambers 20th Century Dictionary

  1. Proof

    prōōf, n. that which proves or establishes the truth of anything: test: (obs.) experience: experiment: any process to discover or establish a truth: that which convinces: demonstration: evidence which convinces the mind: state of having been proved: (pl.) in equity practice, the instruments of evidence in their documentary form: (Scots law) the taking of evidence by a judge upon an issue framed in pleading: a test, hence 'Armour of proof,' armour proved to be trustworthy: (arith.) an operation checking the accuracy of a calculation: firmness of mind: a certain strength of alcoholic spirits: (print.) an impression taken for correction, also 'proof-sheet:' an early impression of an engraving—'proof before letter'=one taken before the title is engraved on the plate: (phot.) the first print from a negative.—adj. firm in resisting: noting alcoholic liquors having the specific gravity 0.920:—pl. Proofs.—ns. Proof′-arm′our, armour proved to be able to resist ordinary weapons; Proof′-charge, an extraordinary amount of powder and shot put into a gun to test its strength; Proof′-house, a house fitted up for proving the barrels of firearms; Proof′-leaf (same as Proof-sheet).—adj. Proof′less, wanting proof or evidence.—ns. Proof′-mark, a mark stamped on a gun to show that it has stood the test; Proof′-read′er, a person who reads printed proofs to discover and correct errors; Proof′-sheet, an impression taken on a slip of paper for correction before printing finally; Proof′-spir′it, a mixture containing fixed proportions of alcohol and water—nearly half its weight and fully half its volume of alcohol; Proof′-text, a passage of Scripture held to prove a certain doctrine.—Artist's proof, a first impression from an engraved plate or block; Burden of proof (see Burden); India proof (see Indian). [O. Fr. prove (Fr. preuve)—L. probāre, to prove.]

Dictionary of Nautical Terms

  1. proof

    The trial of the quality of arms, ammunition, &c., before their reception for service. Guns are proved by various examinations, and by the firing of prescribed charges; powder by examinations, and by carefully measured firings from each batch.

Military Dictionary and Gazetteer

  1. proof

    A term applied to the testing of powder, and also of ordnance, which are always fired with a regulated charge of powder and shot, to test their strength and soundness.

  2. proof

    Conclusive evidence.

  3. proof

    Capable of withstanding; as, bomb-proof, shot-proof.

Editors Contribution

  1. proof

    A process and data to prove.

    The proof of what's occurring is vital.

    Submitted by MaryC on February 12, 2020  

Suggested Resources

  1. proof

    Song lyrics by proof -- Explore a large variety of song lyrics performed by proof on the Lyrics.com website.

British National Corpus

  1. Spoken Corpus Frequency

    Rank popularity for the word 'proof' in Spoken Corpus Frequency: #3664

  2. Written Corpus Frequency

    Rank popularity for the word 'proof' in Written Corpus Frequency: #3410

  3. Nouns Frequency

    Rank popularity for the word 'proof' in Nouns Frequency: #1415

How to pronounce proof?

How to say proof in sign language?


  1. Chaldean Numerology

    The numerical value of proof in Chaldean Numerology is: 5

  2. Pythagorean Numerology

    The numerical value of proof in Pythagorean Numerology is: 7

Examples of proof in a Sentence

  1. Meaghan Buisson:

    The definition of insanity is decreed far too often by individuals with no proof they themselves are sane.

  2. Jack Reed:

    Hamas is a terrorist group. They operate under the principle of terror. And Israel, as a nation-state, has a higher burden of proof to show that these are necessary military raids.

  3. Scott Puritz:

    The DOL has been very prudent about how they’ve gone about this in trying to make their rule litigation-proof, but opponents will sue in court.

  4. Siddharth Sanyal:

    There is no clear proof that CPI is far superior to WPI, monetary policy should not ignore the reality of persistent deflationary numbers on the wholesale index.

  5. Andrey Merkulov:

    The Crimea bridge is a link, it is the greatness and might of my country. It's yet more proof of this might and greatness.

Popularity rank by frequency of use


Translations for proof

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    a decorative musical accompaniment (often improvised) added above a basic melody
    • A. flub
    • B. monish
    • C. descant
    • D. abrade

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