'Hilarity' definitions:

Definition of 'hilarity'

noun

Great merriment [syn: hilarity, mirth, mirthfulness, glee, gleefulness]

From: GCIDE

Hilarity \Hi*lar"i*ty\ (?; 277), n. [L. hilaritas: cf. F. hilarit['e]. See Hilarious.] Boisterous mirth; merriment; jollity. --Goldsmith. [1913 Webster]
Note: Hilarity differs from joy: the latter, excited by good news or prosperity, is an affection of the mind; the former, produced by social pleasure, drinking, etc., which rouse the animal spirits, is more demonstrative.
Syn: Glee; cheerfulness; mirth; merriment; gayety; joyousness; exhilaration; joviality; jollity. [1913 Webster]