arithmetic /əˈrɪθməˌtɪk/ noun Learner's definition of ARITHMETIC
[noncount]
1
: a branch of mathematics that deals with numbers and their addition, subtraction, multiplication, and division算術
2
: the act or process of calculating a number計算;演算 — arithmetic
/ˌerɪθˈmɛtɪk/ or arithmetical /ˌerɪθˈmɛtɪkəl/ adjective — arithmetically
/ˌerɪθˈmɛtɪkli/ adverb