Meaning of “hilarity” in the English Dictionary

british dictionary

"hilarity" in British English

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hilaritynoun [ U ]

uk /hɪˈlær.ə.ti/ us /hɪˈler.ə.t̬i/

a situation in which people laugh very loudly and think something is very funny:

What was all the hilarity about?

(Definition of “hilarity” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)