Definition of arithmetic noun from the Oxford Advanced American Dictionary

     

    arithmetic

     noun
    noun
    NAmE//əˈrɪθməˌtɪk//
     
    [uncountable]
     
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  1. 1the type of mathematics that deals with the adding, multiplying, etc. of numbers He's not very good at arithmetic.
  2. 2maths problems involving the adding, multiplying, etc. of numbers a quick bit of mental arithmetic I think there's something wrong with your arithmetic.
See the Oxford Advanced Learner's Dictionary entry: arithmetic