Vivacity (noun)

Liveliness; animation; spirit; energy.

Origin:

Late middle english, from old french vivacité or latin vivacitas, from vivax, vivac- lively, from vivere to live.

Examples:

1. She spoke with vivacity about her recent trip abroad.
2. The party was enlivened by her vivacity and wit.
3. He was struck by her vivacity, which was in stark contrast to his own melancholy.
4. The dancers performed with vivacity and skill.
5. Her vivacity and enthusiasm were infectious, and everyone in the room was soon smiling and laughing.