Definition of arithmetical adjective from the Oxford Advanced Learner's Dictionary

 

arithmetical

 adjective
adjective
BrE BrE//ˌærɪθˈmetɪkl//
 
; NAmE NAmE//ˌærɪθˈmetɪkl//
 
(also arithmetic)
 
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relating to arithmetic an arithmetical calculation
See the Oxford Advanced American Dictionary entry: arithmetical