Definitions

1. noun

A person or thing that gives energy or vitality

“The coffee shop was a great livener for the morning commute.”

2. noun

A substance, such as a medicine or an anesthetic, that restores or maintains vital functions

“The doctor administered a livener to help stabilize her vital signs.”

3. verb

To give energy or vitality to something

“The news of the company’s success livens up the town’s economy.”