Hilarity (noun)

1. Great merriment and laughter.
2. A state of being filled with cheerfulness and laughter.

Origin:

The word hilarity comes from the latin word "hilaris" meaning "cheerful" or "joyful".

Examples:

1. The comedy show was filled with hilarity.
2. The party was a night of non-stop hilarity.
3. The audience was in hysterics and the room was filled with hilarity.
4. The children's antics caused much hilarity among the adults.
5. The prank caused hilarity among the coworkers.