proof: Meaning and Definition of


Pronunciation: (prf), [key]
— 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; test; trial: to put a thing to the proof.
  4. the establishment of the truth of anything; demonstration.
  5. (in judicial proceedings) evidence having probative weight.
  6. the effect of evidence in convincing the mind.
  7. an arithmetical operation serving to check the correctness of a calculation.
  8. a 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.
    1. the arbitrary standard strength, as of an alcoholic liquor.
    2. strength with reference to this standard: “100 proof ” signifies a proof spirit, usually 50% alcohol.
  10. a trial print from a negative.
  11. to pull a proof.
    1. a trial impression, as of composed type, taken to correct errors and make alterations.
    2. one of a number of early and superior impressions taken before the printing of the ordinary issue:to pull a proof.
  12. (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.
  13. one of a limited number of coins of a new issue struck from polished dies on a blank having a polished or matte surface.
  14. the state of having been tested and approved.
  15. proved strength, as of armor.
  16. the 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. prove (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.
    1. to test the effectiveness of (yeast), as by combining with warm water so that a bubbling action occurs.
    2. to cause (esp. bread dough) to rise due to the addition of baker's yeast or other leavening.


Pronunciation: [key]
  1. a combining form meaning “resistant, impervious to” that specified by the initial element: burglarproof; childproof; waterproof.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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