VIGOR

vigor. Vigor, n. force, stength, efficacy

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Vig″or (?), n. [[OE. vigour, vigor, OF. vigor, vigur, vigour, F. vigueur, fr. L. vigor, fr. vigere to be lively or strong. See Vegetable, Vigil.]] 1. 1. Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; force; energy.
The vigor of this arm was never vain. Dryden. 2. 2. Strength or force in animal or vegetable nature or action; as, a plant grows with vigor.
3. 3. Strength; efficacy; potency.
But in the fruithful earth . . . His beams, unactive else, their vigor find. Milton. ☞ Vigor and its derivatives commonly imply active strength, or the power of action and exertion, in distinction from passive strength, or strength to endure.