ar ‧ ith ‧ met ‧ ic 2 /ˌærɪθˈmetɪk◂/ BrE AmE ( also ar‧ith‧met‧i‧cal /-tɪk ə l/) adjective technical
involving or related to arithmetic:
the arithmetic mean (=average)
—arithmetically /-kli/ adverb
ar ‧ ith ‧ met ‧ ic 2 /ˌærɪθˈmetɪk◂/ BrE AmE ( also ar‧ith‧met‧i‧cal /-tɪk ə l/) adjective technical
involving or related to arithmetic:
the arithmetic mean (=average)
—arithmetically /-kli/ adverb
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012