From The Collaborative International Dictionary of English v.0.48:

Plus \Plus\, a. [L., more; akin to Gr. ?, ?, and E. full. See
   Full, a., and cf. Pi[`u], Pleonasm.]
   [1913 Webster]
   1. (Math.) More, required to be added; positive, as
      distinguished from negative; -- opposed to minus.
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   2. Hence, in a literary sense, additional; real; actual.
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            Success goes invariably with a certain plus or
            positive power.                       --Emerson.
      [1913 Webster]

   Plus sign (Math.), the sign (+) which denotes addition, or
      a positive quantity.
      [1913 Webster]
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