Definition of equanimity noun from the Oxford Advanced Learner's Dictionary

 

equanimity

 noun
noun
BrE BrE//ˌekwəˈnɪməti//
 
; NAmE NAmE//ˌekwəˈnɪməti//
 
[uncountable](formal)
 
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a calm state of mind which means that you do not become angry or upset, especially in difficult situations She accepted the prospect of her operation with equanimity. Word Origin early 17th cent. (also in the sense ‘fairness, impartiality’): from Latin aequanimitas, from aequus ‘equal’ + animus ‘mind’.
See the Oxford Advanced American Dictionary entry: equanimity