1. excessive or extreme in size, degree, or extent (prosperity)
2. joyously unrestricted and enthusiastic (personality)
3. elaborate or unrestricted, especially in style (architecture)
4. produced in abundance (vegetation)
Origin: late Middle English (in the sense ‘overflowing, abounding’): from French exubérant, from Latin exuberant- ‘being abundantly fertile,’ from the verb exuberare (based on uber ‘fertile’).