exuberance

noun

Etymology: From French exubérance, from Latin exuberantia (“superabundance”), from exuberare (“to grow thickly, to abound”); from ex- (“out”) + uber (“udder”), which would have originally referred to a cow or she-goat which was making so much milk that it naturally dripped or sprayed from the udder.

1. The quality of being exuberant; cheerful or vigorous enthusiasm; liveliness.

   “Tottenham's desire for a win against a Norwich side playing with energy and exuberance made for an enthralling, end-to-end game.”

   “The stock market found itself at a similar moment 29 years ago, when Alan Greenspan famously warned of “irrational exuberance” fueling a bubble in internet stocks. The S&P 500 had risen more than 60 percent in the two years before Mr. Greenspan’s speech.”

2. An instance of exuberant behaviour.
3. An overflowing quantity; superfluousness.

   “an exuberance of branches in a plant”

4. An abundance of wealth.