How do you spell Vigor

Available Definitions:
1)  n. - Active strength or force of body or mind; capacity for exertion, physically, intellectually, or morally; force; energy.
2)  n. - Strength or force in animal or force in animal or vegetable nature or action; as, a plant grows with vigor.
3)  n. - Strength; efficacy; potency.
4)  v. t. - To invigorate.