exuberance > define

Joyful enthusiasm.
Overflowing with eager enjoyment or approval.
- synonyms: enthusiasm, ebullience

(n.) The state of being exuberant; an overflowing quantity; a copious or excessive production or supply; superabundance; richness; as, an exuberance of joy, of fancy or of foliage.

by Webster's Revised Unabridged Dictionary