Meaning of ARITHMETIC in English

ARITHMETIC

/ əˈrɪθmətɪk; NAmE / noun [ U ]

1.

the type of mathematics that deals with the adding, multiplying, etc. of numbers :

He's not very good at arithmetic.

2.

sums involving the adding, multiplying, etc. of numbers :

a quick bit of mental arithmetic

I think there's something wrong with your arithmetic.

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WORD ORIGIN

Middle English : from Old French arismetique , based on Latin arithmetica , from Greek arithmētikē (tekhnē) (art) of counting, from arithmos number.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.