noun
hilarity
hih-LAIR-uh-tee/hɪˈlærəti/
Great amusement or laughter.
The shared hilarity leaves one adult doubled over and the other laughing backward.

Etymology
The pieces name a state of cheerfulness or merriment. In the selected sense, that merry state takes the more intense form of great amusement or noisy laughter.
In context
In the midst of the general hilarity, Clare showed her deplorable want of iron by bursting into tears.
More examples
- Their attempts to assemble the tent lead to general hilarity.
- Hilarity ensues when the dog runs off with my slipper.
- We struggle to contain our hilarity during the serious speech.
Forms
hilarious adjective — Causing great amusement or laughter.