■ noun ə'rɪθmətɪk the branch of mathematics concerned with the properties and manipulation of numbers.
↘the use of numbers in counting and calculation.
■ adjective ˌarɪθ'mɛtɪk relating to ~.
Derivatives
~al adjective
~ally adverb
~ian noun
Origin
ME: from OFr. arismetique , based on L. ~a , from Gk arithmētikē (tekhnē) '(art) of counting', from arithmos 'number'.