/ hɪˈleəriəs; NAmE -ˈler-/ adjective
extremely funny :
a hilarious joke / story
Lynn found the whole situation hilarious.
Do you know Pete? He's hilarious.
➡ note at funny
► hil·ari·ous·ly adverb :
hilariously funny
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WORD ORIGIN
early 19th cent.: from Latin hilaris (from Greek hilaros cheerful) + -ous . The sense exceedingly amusing dates from the 1920s.