Ebullience (noun)

1. The state of being excited and full of enthusiasm.
2. The quality of being lively, enthusiastic and full of energy.

Origin:

Late 16th century: from latin ebullient- "bubbling up", from the verb ebullire, from e- (variant of ex-) "out" + bullire "to boil".

Examples:

1. He spoke with ebullience about his recent trip to Paris.
2. She was filled with ebullience as she talked about her new project.
3. The ebullience of the children was contagious.
4. His ebullience was infectious and everyone around him felt happy.
5. The ebullience of the crowd was palpable as they waited for the concert to begin.