Definition of arithmetic noun from the Oxford Advanced Learner's Dictionary

     

    arithmetic

     noun
    noun
    BrE BrE//əˈrɪθmətɪk//
     
    ; NAmE NAmE//əˈrɪθmətɪk//
     
    [uncountable] Mathematical terminology, Types of mathematics
     
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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. See related entries: Mathematical terminology, Types of mathematics
  2. 2sums involving the adding, multiplying, etc. of numbers a quick bit of mental arithmetic (= sums you do in your head, without writing anything down) I think there's something wrong with your arithmetic. I’ve worked out the price, but I need to check the arithmetic. a test of mental arithmetic
  3. Wordfinderalgebra, arithmetic, calculus, equation, geometry, logarithm, maths, numeracy, problem, trigonometry Word Origin Middle English: from Old French arismetique, based on Latin arithmetica, from Greek arithmētikē (tekhnē) ‘(art) of counting’, from arithmos ‘number’.
See the Oxford Advanced American Dictionary entry: arithmetic