Used for situations where something is so funny it causes collective laughter or joy. The stand-up comedian's jokes created an atmosphere of hilarity at the club.
Pro Tip 2/3
Not Subtle
Hilarity implies an obvious, loud, and energetic expression of fun, not just a chuckle or a smile. The clown's fall into the pool was met with uproarious hilarity.
Pro Tip 3/3
Group Experience
Often refers to shared laughter in a group, rather than an individual’s experience. Her impression of their professor had the whole class in stitches of hilarity.