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English definition of “arithmetic”

arithmetic

noun [U] uk   /əˈrɪθ.mə.tɪk/ us    /-t̬ɪk/
the part of mathematics that involves the adding and multiplying, etc. of numbers: I've never been very good at arithmetic. an arithmetic test calculations involving adding and multiplying, etc. numbers: I did some quick mental arithmetic and decided it was going to cost too much. I can't work out which of these is cheaper - could you do the arithmetic?
arithmetical
adjective uk   /ˌær.ɪθˈmet.ɪ.kəl/ us    /ˌer.ɪθˈmet̬-/ (also arithmetic,   /ˌær.ɪθˈmet.ɪk/   )
arithmetical problems
arithmetically
adverb uk   /ˌær.ɪθˈmet.ɪ.kəl.i/ us    /ˌer.ɪθˈmet̬-/
(Definition of arithmetic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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