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2 definitions found
 for Plus sign
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.
        [1913 Webster]
     2. Hence, in a literary sense, additional; real; actual.
        [1913 Webster]
              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]

From WordNet (r) 3.0 (2006) :

  plus sign
      n 1: a sign indicating the operation of addition

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