EQUANIMITY Meaning of EQUANIMITY in English [ ˌɛkwə'nɪmɪti , i:- ]■ noun calmness; composure.Derivativesequanimous ɪ'kwanɪməs , i:- adjective OriginC17: from L. aequanimitas , from aequus 'equal' + animus 'mind'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004