Definition of hilarity noun from the Oxford Advanced American Dictionary

 

hilarity

 noun
noun
NAmE//hɪˈlɛrət̮i//
 
[uncountable]
 
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a state of great amusement which makes people laugh The announcement was greeted with great hilarity. Their appearance caused a great deal of hilarity. There was much hilarity when Geoffrey steamed in ten minutes late.
See the Oxford Advanced Learner's Dictionary entry: hilarity