noun
jocularity
jahk-yuh-LAIR-uh-tee/ˌdʒɑːkjəˈlærəti/
Cheerfulness expressed through jokes and humor.
The woman's jocularity turns a banana into a pretend telephone and makes her companion laugh.

Etymology
The base is a Latin diminutive meaning a little joke. Through an adjective meaning funny or comic, it gives a noun for the quality expressed in cheerful joking.
In context
He tries to make me happy by laughing at my jocularity; but jesters are not deceived.
More examples
- His usual jocularity disappears when the conversation turns serious.
- The host greets us with warm jocularity and a playful remark.
- Even during stressful shifts, the nurses find moments of jocularity.
Forms
jocularity
jocular adjective — Cheerful and fond of making jokes.