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hilarity

[hi-lar-i-tee, -lair-, hahy-] /hɪˈlær ɪ ti, -ˈlɛər-, haɪ-/
noun
1.
cheerfulness; merriment; mirthfulness.
2.
boisterous gaiety or merriment.
Origin of hilarity
1560-1570
1560-70; earlier hilaritie < Latin hilaritās, equivalent to hilari(s) (see hilarious) + -tās -ty2
Related forms
hyperhilarity, noun
Synonyms
2. See mirth.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for hilarity

hilarity

/hɪˈlærɪtɪ/
noun
1.
mirth and merriment; cheerfulness
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for hilarity
n.

mid-15c., from Latin hilaritatem (nominative hilaritas) "cheerfulness, gaiety, merriment," from hilaris "cheerful, gay," from Greek hilaros "cheerful, gay, merry, joyous," related to hilaos "graceful, kindly." In ancient Rome, Hilaria (neuter plural of hilaris) were a class of holidays, times of pomp and rejoicing; there were public ones in honor of Cybele at the spring equinoxes as well as private ones on the day of a marriage or a son's birth.

Online Etymology Dictionary, © 2010 Douglas Harper
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