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

 

hilarity

 noun
noun
BrE BrE//hɪˈlærəti//
 
; NAmE NAmE//hɪˈlærəti//
 
[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. Word Origin late Middle English (in the sense ‘cheerfulness’): from French hilarité, from Latin hilaritas ‘cheerfulness, merriment’, from hilaris, from Greek hilaros ‘cheerful’.
See the Oxford Advanced American Dictionary entry: hilarity