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Mirth is a noun.
noun 1. cheerful or joyful gaiety; mirth; hilarity; laughter. 2. Obsolete. a cause of mirth; a jest, entertainment, etc. (according to Dictionary.Com)
i mirth at my little puppy
Stop the mirth; my face hurts!
I will be unable to contain my mirth much longer!
The unbridled mirth jiggled Santa's girth.
Minions of Mirth happened in 2005.