Definition of proof in English:



  • 1Evidence or argument establishing or helping to establish a fact or the truth of a statement.

    ‘you will be asked to give proof of your identity’
    [count noun] ‘this is not a proof for the existence of God’
    • ‘A little while later he emailed me with irrefutable proof of my guilt.’
    • ‘That's completely absurd and there's no proof to validate that statement.’
    • ‘One of the most important properties I'm interested in when I'm looking for arguments or evidence or proofs or persuasive cases is strength and the ability to bear a lot of weight.’
    • ‘If there is a variation, you may need to supply proof of identity.’
    • ‘No story describing a problem or social phenomenon was complete without a few meaningless statistics passed off as hard fact or proof of some assertion.’
    • ‘The government had no definitive proof of ownership, so therefore everyone was guilty.’
    • ‘That statement is proof of my existence, for how can you make nothing?’
    • ‘His silence is a matter which is neutral in terms of providing positive proof of his guilt.’
    • ‘However, these customers would also have to provide documentary proof of their claims.’
    • ‘Therefore, a total ban on private use of the lagoon requires concrete scientific proof of negative influences.’
    • ‘A retrospective glance at the 2000-2001 regular season offers ample proof of blatant mismatches.’
    • ‘There was, after all, too much proof to the contrary.’
    • ‘The numbers themselves do not constitute definitive proof.’
    • ‘The critics will point to this as irrefutable proof of their argument that vouchers undermine the public school system.’
    • ‘You will need proof of your identity and the address where you are living on election day.’
    • ‘The author finally attempts to provide conclusive proof of Germany's decline in chapter 7.’
    • ‘They are based on the false assumption that the substantive offence requires proof of a fact that life is endangered.’
    • ‘It is too easy to find fault, to point a finger, without any facts or proof.’
    • ‘Many atheists demand a scientific proof for the existence of God.’
    • ‘Always check the seller's identity by asking for proof of name and address and be wary of sellers who want to meet you anywhere other than their home.’
    evidence, verification, corroboration, authentication, confirmation, certification, validation, attestation, demonstration, substantiation, witness, testament
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    1. 1.1Law The spoken or written evidence in a trial.
      • ‘Counsel set out parts of the appellant's proof of evidence available at the trial.’
      • ‘Until the evidentiary threshold of proof beyond a reasonable doubt is reached, the judge and the Constitution order the jury to acquit.’
      • ‘The laws of evidence and proof are aimed at establishing beyond a doubt which individual is guilty.’
      • ‘The burden of proof on the balance of probabilities lies on the defendant.’
      • ‘In a criminal case you need to have proof beyond a reasonable doubt.’
    2. 1.2The action or process of establishing the truth of a statement.
      ‘it shifts the onus of proof in convictions from the police to the public’
      • ‘As a result, it seemed to them that the objectivity of scientific knowledge was no longer capable of proof.’
    3. 1.3archaic A test or trial.
      criterion, indication, yardstick, touchstone, standard, measure, litmus test, barometer
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    4. 1.4A series of stages in the resolution of a mathematical or philosophical problem.
      • ‘We wish to expound in detail some of the many proofs of this theorem.’
      • ‘So, in the absence of a mathematical proof deciding this question, none of us has any a priori knowledge about this question in either direction.’
      • ‘His publications include a biography of Leonhard Euler and a booklet on mathematical proofs.’
      • ‘His main work involved applying philosophy to mathematics, the philosophy taking precedence over rigorous mathematical proofs.’
      • ‘I shall carry out such a consistency proof for elementary number theory.’
      • ‘On the other hand he had only a vague idea of what constitutes a mathematical proof.’
      • ‘The proof of this theorem makes essential use of free choice sequences.’
      • ‘For example, in proofs about sets, Venn diagrams provided a useful part of a concept image in some cases.’
      • ‘Nguyen's work is one manifestation of her longstanding love for rigorous and creative mathematical proofs.’
      • ‘It gives a proof that every whole number has a Fibonacci number for which it is a factor.’
      • ‘From such a viewpoint, it would seem possible to arrange mathematical proofs into strata characterized by their degree of simplicity.’
      • ‘Fermat subsequently died, leaving mathematicians to search for 350 years for a proof of the theorem.’
      • ‘An argument becomes a proof when the mathematical community agrees it is such.’
      • ‘Euclid changed the proofs of several theorems in this book so that they fitted the new definition of proportion given by Eudoxus.’
      • ‘Mathematical proofs of conjectures, however, require more than overwhelming numerical evidence.’
      • ‘The only thing that's missing is perhaps a very solid idea of what it means to do a mathematical proof.’
      • ‘Mathematicians later found proofs for other special cases.’
      • ‘This faith in the indubitable certainty of mathematical proofs was sadly shaken around 1900 by the discovery of the antinomies or paradoxes of set theory.’
      • ‘In a nutshell, it asks for the simplest proof of any theorem.’
      • ‘How many proofs do mathematicians publish each year?’
  • 2A trial print of something, in particular.

    • ‘For that reason, she charges as much as 30 percent more for an artist's proof.’
    • ‘The artist comes to examine the proof, and, if it meets with his approval, the full edition is printed from the plates.’
    • ‘Adams did give Kuh at least one trial proof, which she later donated to the Art Institute of Chicago.’
    • ‘Within two days of submitting a print job, customers can view an electronic job proof by downloading either an HTML or an Adobe PDF file.’
    • ‘In preparation for printing, a digital technician prints a proof.’
    • ‘There are several points I agree on, mainly the overpricing of an artist's proof.’
    1. 2.1Printing A trial impression of a page, taken from type or film and used for making corrections before final printing.
      • ‘Their intention has been to wait for the final proofs of their articles before correcting the intentional misstatements.’
      • ‘I had before me a stack of final proofs to approve, but under the circumstances it was nearly impossible to read them; every word seemed trivial in comparison to the horrific tragedy.’
      • ‘I was scheduled to spend much of the day correcting the final proofs of my forthcoming biography, Nehru: The Invention of India.’
      • ‘I turned the pages and noted all the red correction marks on my proofs, cradling my pounding head in my hands.’
      • ‘Stuart had completed all of his editing and writing for volume 7 before his death and was looking forward to reading the final proofs.’
      page proof, galley proof, galley, pull, slip, trial print
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    2. 2.2A trial photographic print made for initial selection.
      • ‘About 6000 of Robert's negatives and picture proofs are held by the Alexander Turnbull Library in Wellington.’
      • ‘I found your article on the value of so-called artist's proofs extremely interesting.’
      • ‘Artist's proofs can be numbered, but often they are not.’
      • ‘The trial proofs were rejected, and the finished photographs never made.’
    3. 2.3Each of a number of impressions from an engraved plate, especially (in commercial printing) of a limited number before the ordinary issue is printed and before an inscription or signature is added.
      • ‘This exhibition - including so many large prints, so many of their proofs and their matrices - demands a lot of wall space.’
      • ‘Dürer published quite large numbers of his woodcut series in proofs before text on the reverse of the sheet.’
      • ‘Oscar Marshall may also have offered a limited number of hand-signed proofs.’
      • ‘He owned eight paintings and fourteen drawings, nine etchings on Japanese paper, fifty-nine separate proofs and an almost complete set of his prints.’
      • ‘Sometimes artist's proofs are used to hide the real number of an edition.’
    4. 2.4Any of various preliminary impressions of coins struck as specimens.
  • 3The strength of distilled alcoholic liquor, relative to proof spirit taken as a standard of 100.

    [in combination] ‘powerful 132-proof rum’
    • ‘Your liver processes alcohol out of your system at an average rate of about 1.5 ounces of 80 proof alcohol an hour.’
    • ‘Before aging, bourbon's proof must be lowered to no higher than 125 proof using distilled water.’
    • ‘This hand-selected whiskey was bottled at 94 proof in elegantly sculpted decanters.’


  • 1Able to withstand something damaging; resistant.

    ‘the marine battle armor was proof against most weapons’
    [in combination] ‘the system comes with idiot-proof instructions’
    • ‘Maybe it's just as well that we have these idiot-proof tills, because without them the numerically challenged would be all but unemployable and we'd have to support them through a lifetime on the dole.’
    • ‘Beat the mixture lightly and pour it into individual oven-proof pots.’
    • ‘Work has protected wildlife along the route, including measures to keep a colony of protected great crested newts safe, badger tunnels and deer-proof fencing.’
    • ‘She explained that 12 staff joined colleagues from across the county to update their training in the use of the chemical-proof suits.’
    • ‘We need proper sanitation and proper rat-proof construction.’
    • ‘Inclinations towards freedom, however, are not proof against systematic countermeasures.’
    resistant, impenetrable, impervious, repellent
    proofed, treated
    waterproof, windproof, rainproof, leakproof, damp-proof, weatherproof, bulletproof, bombproof, fireproof, soundproof, childproof, tamper-proof
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  • 2[attributive] Denoting a trial impression of a page or printed work.

    ‘a proof copy is sent up for checking’
    • ‘The following categories of nationalistic blessing and their proof texts indicate they do.’
    • ‘Accompanying the CD-R is a set of proof pages that the printer can use to make sure that the magazine that is being printed matches the sample pages.’
    • ‘No, I don't mind people buying proof copies, but I'd advise against buying them to collect.’
    • ‘I am continuing to work on my book, proof reading and such.’
    • ‘Having been sent an early proof copy, I have already been using it for some months.’
    • ‘I am always impressed with accurate proof reading.’
    • ‘Next came the bound proof copies, incorporating quite long extracts from these letters.’
    • ‘A proof print is an example taken when the work is incomplete or not ready for publication.’
    • ‘Then the printer stepped in, rubbed ink on the raised lines and made several proof copies from the relief block.’
    • ‘You know, I don't really mind people selling proof copies on e-bay.’
    • ‘Then a set of proof prints is sent to the artist to review.’
    • ‘Keynes was asked to comment on the proof copy of the work.’
    • ‘I read this short novel a few months ago, in a proof copy, knowing nothing about the author.’
    • ‘Students helped enter more than 800,000 entries, and helped with proof reading.’


  • 1Make (fabric) waterproof.

    ‘the tent is made from proofed nylon’
    • ‘You can spray the line with silicone line float (or I use the silicone sprays used for proofing nylon tents).’
  • 2Make a proof of (a printed work, engraving, etc.)

    ‘proofing could be done on a low-cost printer’
    • ‘So sketches were sketched, proofs were proofed, copies were bound.’
    • ‘When their concepts were finalized, students made a working model by proofing their work in black and white on the artroom's laser printer.’
    • ‘As they become available from Weblications, the company scanning and proofing them, they will be put up for readers to consult.’
    set in print, send to press, run off, preprint, reprint, pull, proof, copy, reproduce
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    1. 2.1Proofread (a text)
      ‘a book about dinosaurs was being proofed by the publisher’
      • ‘I don't even know what the job is, but I'll proof milk cartons at this point.’
      • ‘He was asking me to proof something I'd already proofed, saying they'd made more changes.’
      • ‘Her mother was already at the table proofing the documents she would need that day for her board meeting.’
      • ‘Vitally, this interval permitted the whole paper to be proofed before printing.’
      • ‘She also has had all contact with authors, edited and tagged the journal pages, and proofed them.’
      • ‘If you are not the best at proofing your own documents, have an eagle-eyed assistant or colleague on hand to review them for you.’
      • ‘Please also keep in mind that my beta reader hasn't proofed this yet.’
      • ‘Together we evolved a monthly theme, subbed, rewrote and proofed the magazine.’
  • 3North American Activate (yeast) by the addition of liquid.

    • ‘This morning's recipe was the first he'd found that called for proofing the yeast with warm water and sugar; previous methods had called, somewhat illogically, for the yeast to be added dry to the flour.’
    1. 3.1Knead (dough) until light and smooth.
    2. 3.2[no object](of dough) prove.
      ‘shape into a baguette and let proof for a few minutes’
      • ‘Brush lightly with egg wash, cover with a damp cloth, and set aside to proof until double in volume, about 30 minutes.’
      • ‘If you're proofing at higher temperatures, your dough will rise faster, so you'll need to keep an eye on it.’


Middle English preve, from Old French proeve, from late Latin proba, from Latin probare to test, prove The change of vowel in late Middle English was due to the influence of prove. Current senses of the verb date from the late 19th century.