To be in a state of exuberance; to exhibit abundant enthusiasm or high spirits.
From Latin 'exuberare' (ex- 'out' + uberare 'to be fruitful'), this verb directly reflects the original Latin sense of overflowing with abundance and fertility.
This is the parent verb from which all the exuber- words derive, and it literally means 'to overflow like fruit'—the metaphor is all about abundance bursting forth.
Complete word intelligence in one call. Free tier — 50 lookups/day.