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2 definitions found
 for Proof impression
From The Collaborative International Dictionary of English v.0.48 :

  Impression \Im*pres"sion\, n. [F. impression, L. impressio.]
     1. The act of impressing, or the state of being impressed;
        the communication of a stamp, mold, style, or character,
        by external force or by influence.
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     2. That which is impressed; stamp; mark; indentation;
        sensible result of an influence exerted from without.
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              The stamp and clear impression of good sense.
                                                    --Cowper.
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              To shelter us from impressions of weather, we must
              spin, we must weave, we must build.   --Barrow.
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     3. That which impresses, or exercises an effect, action, or
        agency; appearance; phenomenon. [Obs.]
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              Portentous blaze of comets and impressions in the
              air.                                  --Milton.
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              A fiery impression falling from out of Heaven.
                                                    --Holland.
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     4. Influence or effect on the senses or the intellect hence,
        interest, concern. --Reid.
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              His words impression left.            --Milton.
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              Such terrible impression made the dream. --Shak.
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              I have a father's dear impression,
              And wish, before I fall into my grave,
              That I might see her married.         --Ford.
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     5. An indistinct notion, remembrance, or belief.
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     6. Impressiveness; emphasis of delivery.
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              Which must be read with an impression. --Milton.
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     7. (Print.) The pressure of the type on the paper, or the
        result of such pressure, as regards its appearance; as, a
        heavy impression; a clear, or a poor, impression; also, a
        single copy as the result of printing, or the whole
        edition printed at a given time; as, a copy from the fifth
        impression.
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              Ten impressions which his books have had. --Dryden.
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     8. In painting, the first coat of color, as the priming in
        house painting and the like. [R.]
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     9. (Engraving) A print on paper from a wood block, metal
        plate, or the like.
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     Proof impression, one of the early impressions taken from
        an engraving, before the plate or block is worn.
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From The Collaborative International Dictionary of English v.0.48 :

  Proof \Proof\, a.
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     1. Used in proving or testing; as, a proof load, or proof
        charge.
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     2. Firm or successful in resisting; as, proof against harm;
        waterproof; bombproof.
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              I . . . have found thee
              Proof against all temptation.         --Milton.
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              This was a good, stout proof article of faith.
                                                    --Burke.
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     3. Being of a certain standard as to strength; -- said of
        alcoholic liquors.
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     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 (Engin.), 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 spirit (Chem.), 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 60[deg]
        Fahrenheit 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 51[deg] Fahrenheit
        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.
  
     Proof staff, a straight-edge used by millers to test the
        flatness of a stone.
  
     Proof stick (Sugar Manuf.), a rod in the side of a vacuum
        pan, for testing the consistency of the sirup.
  
     Proof text, a passage of Scripture used to prove a
        doctrine.
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