From The Collaborative International Dictionary of English v.0.48:

Negative \Neg"a*tive\ (n[e^]g"[.a]*t[i^]v), a. [F. n['e]gatif,
   L. negativus, fr. negare to deny. See Negation.]
   1. Denying; implying, containing, or asserting denial,
      negation or refusal; returning the answer no to an inquiry
      or request; refusing assent; as, a negative answer; a
      negative opinion; -- opposed to affirmative.
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            If thou wilt confess,
            Or else be impudently negative.       --Shak.
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            Denying me any power of a negative voice. --Eikon
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            Something between an affirmative bow and a negative
            shake.                                --Dickens.
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   2. Not positive; without affirmative statement or
      demonstration; indirect; consisting in the absence of
      something; privative; as, a negative argument; negative
      evidence; a negative morality; negative criticism.
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            There in another way of denying Christ, . . . which
            is negative, when we do not acknowledge and confess
            him.                                  --South.
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   3. (Logic) Asserting absence of connection between a subject
      and a predicate; as, a negative proposition.
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   4. (Photog.) Of or pertaining to a picture upon glass or
      other material, in which the lights and shades of the
      original, and the relations of right and left, are
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   5. (Chem.) Metalloidal; nonmetallic; -- contrasted with
      positive or basic; as, the nitro group is negative.
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   Note: This word, derived from electro-negative, is now
         commonly used in a more general sense, when acidiferous
         is the intended signification.
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   Negative crystal.
      (a) A cavity in a mineral mass, having the form of a
      (b) A crystal which has the power of negative double
          refraction. See refraction.

   negative electricity (Elec.), the kind of electricity which
      is developed upon resin or ebonite when rubbed, or which
      appears at that pole of a voltaic battery which is
      connected with the plate most attacked by the exciting
      liquid; -- formerly called resinous electricity. Opposed
      to positive electricity. Formerly, according to
      Franklin's theory of a single electric fluid, negative
      electricity was supposed to be electricity in a degree
      below saturation, or the natural amount for a given body.
      See Electricity.

   Negative eyepiece. (Opt.) see under Eyepiece.

   Negative quantity (Alg.), a quantity preceded by the
      negative sign, or which stands in the relation indicated
      by this sign to some other quantity. See Negative sign

   Negative rotation, right-handed rotation. See
      Right-handed, 3.

   Negative sign, the sign -, or minus (opposed in
      signification to +, or plus), indicating that the
      quantity to which it is prefixed is to be subtracted from
      the preceding quantity, or is to be reckoned from zero or
      cipher in the opposite direction to that of quanties
      having the sign plus either expressed or understood; thus,
      in a - b, b is to be substracted from a, or regarded as
      opposite to it in value; and -10[deg] on a thermometer
      means 10[deg] below the zero of the scale.
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From The Collaborative International Dictionary of English v.0.48:

Negative \Neg"a*tive\ (n[e^]g"[.a]*t[i^]v), n. [Cf. F.
   1. A proposition by which something is denied or forbidden; a
      conception or term formed by prefixing the negative
      particle to one which is positive; an opposite or
      contradictory term or conception.
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            This is a known rule in divinity, that there is no
            command that runs in negatives but couches under it
            a positive duty.                      --South.
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   2. A word used in denial or refusal; as, not, no.
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   Note: In Old England two or more negatives were often joined
         together for the sake of emphasis, whereas now such
         expressions are considered ungrammatical, being chiefly
         heard in iliterate speech. A double negative is now
         sometimes used as nearly or quite equivalent to an
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               No wine ne drank she, neither white nor red.
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               These eyes that never did nor never shall
               So much as frown on you.           --Shak.
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   3. The refusal or withholding of assents; veto.
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            If a kind without his kingdom be, in a civil sense,
            nothing, then . . . his negative is as good as
            nothing.                              --Milton.
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   4. That side of a question which denies or refuses, or which
      is taken by an opposing or denying party; the relation or
      position of denial or opposition; as, the question was
      decided in the negative.
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   5. (Photog.) A picture upon glass or other material, in which
      the light portions of the original are represented in some
      opaque material (usually reduced silver), and the dark
      portions by the uncovered and transparent or
      semitransparent ground of the picture.
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   Note: A negative is chiefly used for producing photographs by
         means of passing light through it and acting upon
         sensitized paper, thus producing on the paper a
         positive picture.
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   6. (Elect.) The negative plate of a voltaic or electrolytic
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   Negative pregnant (Law), a negation which implies an
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From The Collaborative International Dictionary of English v.0.48:

Negative \Neg"a*tive\ (n[e^]g"[.a]*t[i^]v), v. t. [imp. & p. p.
   Negatived (n[e^]g"[.a]*t[i^]vd); p. pr. & vb. n.
   1. To prove unreal or untrue; to disprove.
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            The omission or infrequency of such recitals does
            not negative the existence of miracles. --Paley.
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   2. To reject by vote; to refuse to enact or sanction; as, the
      Senate negatived the bill.
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   3. To neutralize the force of; to counteract.
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From The Collaborative International Dictionary of English v.0.48:

eyepiece \eye"piece`\ eye-piece \eye"-piece`\, n. (Opt.)
   The lens, or combination of lenses, at the eye end of a
   microscope, telescope or other optical instrument, through
   which the image formed by the mirror or object glass is

   Syn: ocular.
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   Collimating eyepiece. See under Collimate.

   Negative, or Huyghenian, eyepiece, an eyepiece
      consisting of two plano-convex lenses with their curved
      surfaces turned toward the object glass, and separated
      from each other by about half the sum of their focal
      distances, the image viewed by the eye being formed
      between the two lenses. it was devised by Huyghens, who
      applied it to the telescope. Campani applied it to the
      microscope, whence it is sometimes called {Campani's

   Positive eyepiece, an eyepiece consisting of two
      plano-convex lenses placed with their curved surfaces
      toward each other, and separated by a distance somewhat
      less than the focal distance of the one nearest eye, the
      image of the object viewed being beyond both lenses; --
      called also, from the name of the inventor, {Ramsden's

   terrestrial, or Erecting eyepiece, an eyepiece used in
      telescopes for viewing terrestrial objects, consisting of
      three, or usually four, lenses, so arranged as to present
      the image of the object viewed in an erect position.
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