\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. 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. Strength or force in animal or force in animal or
   vegetable nature or action; as, a plant grows with vigor.
3. Strength; efficacy; potency.
         But in the fruithful earth . . . His beams, unactive
         else, their vigor find.               --Milton.
Note: Vigor and its derivatives commonly imply active
      strength, or the power of action and exertion, in
      distinction from passive strength, or strength to
      endure.

\Vig"or\, v. t.
To invigorate. [Obs.] --Feltham.