Etymology
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hilarious (adj.)

1823, "cheerful," from Latin hilaris "cheerful, lively, merry, joyful, of good cheer" (see hilarity) + -ous. Meaning "boisterously joyful" is from 1835. Related: Hilariously.

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Definitions of hilarious

hilarious (adj.)
marked by or causing boisterous merriment or convulsive laughter;
hilarious broad comedy
Synonyms: screaming / uproarious
From wordnet.princeton.edu