Definition of plus preposition from the Oxford Advanced American Dictionary

        

    plus1

     preposition
    preposition
    NAmE//plʌs//
     
     
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  1. 1 used when the two numbers or amounts mentioned are being added together Two plus five is seven. The cost is $22, plus $1.50 for postage. Membership is 350 dollars per year plus tax. opposite minus
  2. 2as well as something or someone; and also We have to fit five of us plus all our gear in the car. opposite minus
  3. Idioms
    plus or minus
     
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    used when the number mentioned may actually be more or less by a particular amount synonym give or take The margin of error was plus or minus three percentage points.
See the Oxford Advanced Learner's Dictionary entry: plus