Definition of triumphalism noun from the Oxford Advanced American Dictionary

 

triumphalism

 noun
noun
NAmE//traɪˈʌmfəˌlɪzəm//
 
[uncountable](disapproving)
 
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behavior that celebrates a victory or success in a way that is too proud and intended to upset the people you have defeated
triumphalist
 
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NAmE//traɪˈʌmfəlɪst//
 
adjective
See the Oxford Advanced Learner's Dictionary entry: triumphalism