UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈpruːf/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/pruf/ ,USA pronunciation: respelling(pro̅o̅f )

WordReference Random House Learner's Dictionary of American English © 2020
proof /pruf/USA pronunciation   n. 
  1. [uncountable] evidence or facts that are sufficient to establish a thing as true or believable.
  2. Mathematics, Philosophy[countable]a sequence of steps, statements, or demonstrations that leads to and establishes a valid conclusion.
  3. Wine[uncountable] the strength of an alcoholic liquor, esp. with reference to the standard whereby 100 proof signifies an alcoholic content of 50 percent.
  4. Photography[countable]a print made from a negative of a photograph for checking quality.
  5. Printing[countable]a preliminary copy, as of a manuscript, that is printed for correction or changes.

adj. [be + ~]
  1. able to withstand or resist something harmful or undesirable:a shelter that was proof against the cold.

v. [+ object]
  1. to proofread:Proof the document.See -prov-.

-proof, suffix. 
  • -proof is used to form adjectives with the meaning "resistant;
    not allowing through'' the word mentioned:child + -proof → childproof (= resistant to a child opening it);water + proof → waterproof (= not allowing water through).

  • WordReference Random House Unabridged Dictionary of American English © 2020
    proof  (pro̅o̅f ),USA pronunciation n. 
    1. evidence sufficient to establish a thing as true, or to produce belief in its truth.
    2. anything serving as such evidence:What proof do you have?
    3. the act of testing or making trial of anything;
      trial:to put a thing to the proof.
    4. the establishment of the truth of anything;
    5. Law(in judicial proceedings) evidence having probative weight.
    6. the effect of evidence in convincing the mind.
    7. Mathematicsan arithmetical operation serving to check the correctness of a calculation.
    8. Mathematics, Philosophya sequence of steps, statements, or demonstrations that leads to a valid conclusion.
    9. a test to determine the quality, durability, etc., of materials used in manufacture.
    10. Wine[Distilling.]
      • the arbitrary standard strength, as of an alcoholic liquor.
      • strength with reference to this standard: "100 proof '' signifies a proof spirit, usually 50% alcohol.
    11. Photographya trial print from a negative.
    12. [Print.]
      • Printinga trial impression, as of composed type, taken to correct errors and make alterations.
      • Printingone of a number of early and superior impressions taken before the printing of the ordinary issue:to pull a proof.
    13. Printing(in printmaking) an impression taken from a plate or the like to show the quality or condition of work during the process of execution;
      a print pulled for examination while working on a plate, block, stone, etc.
    14. Currency[Numis.]one of a limited number of coins of a new issue struck from polished dies on a blank having a polished or matte surface.
    15. the state of having been tested and approved.
    16. proved strength, as of armor.
    17. Scottish Termsthe trial of a case by a judge alone, without a jury.

    1. able to withstand;
      successful in not being overcome:proof against temptation.
    2. impenetrable, impervious, or invulnerable:proof against outside temperature changes.
    3. used for testing or proving;
      serving as proof.
    4. of standard strength, as an alcoholic liquor.
    5. of tested or proven strength or quality:proof armor.
    6. noting pieces of pure gold and silver that the U.S. assay and mint offices use as standards.

    1. to test;
      examine for flaws, errors, etc.;
      check against a standard or standards.
    2. Printingprove (def. 7).
    3. to proofread.
    4. to treat or coat for the purpose of rendering resistant to deterioration, damage, etc. (often used in combination):to proof a house against termites; to shrink-proof a shirt.
    5. Food[Cookery.]
      • to test the effectiveness of (yeast), as by combining with warm water so that a bubbling action occurs.
      • to cause (esp. bread dough) to rise due to the addition of baker's yeast or other leavening.
    • Late Latin proba a test, akin to Latin probāre to test and find good; compare pree
    • Middle French preve, proeve, prueve
    • Middle English prove, prooff, prof, proufe, alteration (by association with the vowel of prove) of preove, proeve, prieve, pref 1175–1225
      • 1.See corresponding entry in Unabridged confirmation, demonstration, corroboration, support. See  evidence. 
      • 3.See corresponding entry in Unabridged examination, assay.
      • 18.See corresponding entry in Unabridged firm, steadfast.

  • a combining form meaning "resistant, impervious to'' that specified by the initial element:burglarproof;childproof;waterproof.

  • Collins Concise English Dictionary © HarperCollins Publishers::
    proof /pruːf/ n
    1. any evidence that establishes or helps to establish the truth, validity, quality, etc, of something
    2. the whole body of evidence upon which the verdict of a court is based
    3. a sequence of steps or statements that establishes the truth of a proposition
    4. the act of testing the truth of something (esp in the phrase put to the proof)
    5. trial before a judge without a jury
    6. a trial impression made from composed type, or a print-out (from a laser printer, etc) for the correction of errors
    7. (in engraving, etc) a print made by an artist or under his supervision for his own satisfaction before he hands the plate over to a professional printer
    8. a trial print from a negative
    9. the alcoholic strength of proof spirit
    10. the strength of a beverage or other alcoholic liquor as measured on a scale in which the strength of proof spirit is 100 degrees
    1. (usually postpositive) followed by against: able to resist; impervious (to): the roof is proof against rain
    2. having the alcoholic strength of proof spirit
    3. of proved strength or impenetrability: proof armour
    1. (transitive) to take a proof from (type matter, a plate, etc)
    2. to proofread (text) or inspect (a print, etc), as for approval
    3. to render (something) proof, esp to waterproof
    Etymology: 13th Century: from Old French preuve a test, from Late Latin proba, from Latin probāre to test
    Collins Concise English Dictionary © HarperCollins Publishers::
    -proof adj , combining form
    1. secure against (damage by); (make) impervious to: waterproof, mothproof, childproof
    Etymology: from proof (adj)
    'proof' also found in these entries:
    Collocations: proof [a draft, a plan, a print, the article], have legal proof (of), is [tamper, idiot, future] -proof, more...

    Forum discussions with the word(s) "proof" in the title:

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