Definition of plus preposition from the Oxford Advanced Learner's Dictionary

        

    plus1

     preposition
    preposition
    BrE BrE//plʌs//
     
    ; NAmE NAmE//plʌs//
     
    Mathematical terminology
     
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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 for postage. Membership is 350 dollars per year plus tax. See related entries: Mathematical terminology
  2. 2  as well as something/somebody; and also We have to fit five of us plus all our gear in the car.
  3. opposite minus
    Word Origin mid 16th cent.: from Latin, literally ‘more’.Idioms 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 American Dictionary entry: plus