Mirth (noun)

1. Amusement, especially as expressed in laughter.
2. A feeling of great pleasure or happiness.

Origin:

From old english myrð, from proto-germanic *mērþaz, from proto-indo-european *mréǵh- ("to rejoice, be gla.d")

Examples:

1. The children's laughter filled the room with mirth.
2. The clown's jokes brought mirth to the audience.
3. The party was filled with mirth and laughter.
4. The news filled him with great mirth.
5. The couple shared a moment of mirth.