From The Collaborative International Dictionary of English v.0.48:

Minus \Mi"nus\ (m[imac]"n[u^]s), a. [L. See Minor, and cf.
   Mis- pref. from the French.] (Math.)
   Less; requiring to be subtracted; negative; as, a minus
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   Minus sign (Math.), the sign [-] denoting minus, or less,
      prefixed to negative quantities, or quantities to be
      subtracted. See Negative sign, under Negative.
      [1913 Webster]

From The Collaborative International Dictionary of English v.0.48:

minus \mi"nus\ (m[imac]"n[u^]s), n.; pl. minuses
   A factor counted as a disadvantage; a loss or potential loss
   in a situation or plan; as, he added up all the pluses and
   minuses and decided not to do it; as, the lack of money is a
   big minus in an election campaign.

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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