Vitality

Etymology: From Latin vita http://en.wiktionary.org/wiki/vita#Latin, which means life.

Outside of its own existence or source, life is only recognized through some form of expression or dynamic. A living organism experiences its own life from the internal dynamics of its own being, something not observable from outside - in the absence of an expression or dynamic.

Can there be vitality (life) with no expression or dynamic (internal or external)? By this definition the answer would need to be : "No."