jocundity
definition
the state of being cheerful and lighthearted
example
The jocundity of the children playing in the park filled the air with laughter and joy.
synonyms
merrimentcheerfulnessgaiety
word origin — from Latin 'jocunditas', derived from 'jocundus', meaning 'pleasant, joyful'; related to 'jocus' meaning 'joke'