Definition of hilarity in English:

hilarity

Syllabification: hi·lar·i·ty
Pronunciation: /həˈle(ə)ritē
 
/

noun

Origin

late Middle English (in the sense 'cheerfulness'): from French hilarité, from Latin hilaritas 'cheerfulness, merriment', from hilaris (see hilarious).

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Word of the day kerf
Pronunciation: kəːf
noun
a slit made by cutting with a saw