Definition of equanimity noun from the Oxford Advanced American Dictionary

 

equanimity

 noun
noun
NAmE//ˌikwəˈnɪmət̮i//
 
, NAmE//ˌɛkwəˈnɪmət̮i//
 
[uncountable](formal)
 
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a calm state of mind that means that you do not become angry or upset, especially in difficult situations She accepted the prospect of her operation with equanimity.
See the Oxford Advanced Learner's Dictionary entry: equanimity