Vigour

Noun

 * 1) Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; force; energy.
 * 2)  Strength or force in animal or force in animal or vegetable nature or action; as, a plant grows with vigor.
 * 3) Strength; efficacy; potency.

Derived terms

 * envigorate
 * vigorous
 * hybrid vigor

Related terms

 * vegetable
 * vigil

Alternative forms

 * vigor

Etymology
From, from vigour:, from  vigor:, from  vigor:, from vigeo:, from.

Related to vigil:, and more distantly compare vis: and vital:, from similar Proto-Indo-European roots and meanings (lively, power, life), via Latin.