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

 

hedonism

 noun
noun
BrE BrE//ˈhiːdənɪzəm//
 
; NAmE NAmE//ˈhiːdənɪzəm//
 
[uncountable]
 
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the belief that pleasure is the most important thing in life Word Origin mid 19th cent.: from Greek hēdonē ‘pleasure’ + -ism.
See the Oxford Advanced American Dictionary entry: hedonism