Vigor

n.	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 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.
v. t.	1.	To invigorate.

Noun	1.	vigor - an exertion of force; "he plays tennis with great energy" Synonyms: vigour, energy
	2.	vigor - active strength of body or mind Synonyms: vigour
	3.	vigor - an imaginative lively style (especially style of writing); "his writing conveys great energy" Synonyms: vim, vigour, energy

amperage, animal spirits, animation, armipotence, authority, bang, beef, bite, bitingness, black power, bounce, brio, briskness, brute force, capacity, capersomeness, charge, charisma, clout, cogence, cogency, coltishness, compulsion, cuttingness, decisiveness, demonic energy, dint, drive, duress, dynamism, eagerness, effect, effectiveness, effectuality, elan, endurance, enthusiasm, ergal, esprit, exuberance, flower power, force, force majeure, forcefulness, friskiness, frolicsomeness, full blast, full force, gaiety, gamesomeness, gayness, get-up-and-go, getup, go, gusto, guts, gutsiness, haleness, hardiness, healthiness, heartiness, impressiveness, incisiveness, influence, intensity, intestinal fortitude, kinetic energy, life, liveliness, longevity, lustihood, lustiness, main force, main strength, mana, manliness, mettle, mettlesomeness, might, might and main, mightiness, mordancy, moxie, muscle, muscle power, muscularity, nervosity, nervousness, obstinacy, oomph, pep, piss and vinegar, pith, pizzazz, playfulness, poignancy, poop, potence, potency, potential energy, potentiality, power, power pack, power structure, power struggle, powerfulness, prepotency, productiveness, productivity, puissance, pull, punch, push, resilience, robustness, rollicksomeness, rompishness, ruggedness, sinew, sinewiness, skittishness, snap, soundness, spiritedness, spirits, sportiveness, sprightliness, spunk, stalwartness, stamina, starch, staying power, steam, sticking power, stoutness, strength of will, strenuousness, strong arm, strong language, sturdiness, superiority, superpower, toughness, trenchancy, validity, vehemence, vigorousness, vim, virility, virtue, virulence, vivacity, wattage, weight, zealousness, zest, zestfulness, zing, zip