How Do You Define Vitality?

Vitality was not a word that i heard in medical school. It really wasn't a word other than in the context wi like richard simonds in dancing todoldies or something. And so kind of boiling that down, what does that mean in your everyday life? And really what i call, like the three seas, that's where it emerged. What are the everyday ways that people experience vitality,. and what was vitality enhancing, and what was devitalizing? And like vitality diminishing?