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

 

triumphalism

 noun
noun
BrE BrE//traɪˈʌmfəlɪzəm//
 
; NAmE NAmE//traɪˈʌmfəlɪzəm//
 
[uncountable](disapproving) Proud
 
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behaviour that celebrates a victory or success in a way that is too proud and intended to upset the people you have defeated See related entries: Proud
See the Oxford Advanced American Dictionary entry: triumphalism