Meaning of “hilarious” in the English Dictionary

"hilarious" in British English

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hilariousadjective

uk /hɪˈleə.ri.əs/ us /hɪˈler.i.əs/

C1 extremely funny and causing a lot of laughter:

He didn't like the film at all - I thought it was hilarious.
hilariously
adverb uk /hɪˈleə.ri.əs.li/ us /hɪˈler.i.əs.li/

Her new book's hilariously funny.

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

"hilarious" in American English

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hilariousadjective

us /hɪˈleər·i·əs/

extremely amusing and causing a lot of laughter:

Her jokes are absolutely hilarious.

(Definition of “hilarious” from the Cambridge Academic Content Dictionary © Cambridge University Press)