The Collaborative International Dictionary of English v.0.48:

Vitality \Vi*tal"i*ty\ (?; 277), n. [L. vitalitas: cf. F.
   vitalit['e].]
   The quality or state of being vital; the principle of life;
   vital force; animation; as, the vitality of eggs or vegetable
   seeds; the vitality of an enterprise.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vitality
    n 1: an energetic style [syn: vitality, verve]
    2: a healthy capacity for vigorous activity; "jogging works off
       my excess energy"; "he seemed full of vim and vigor" [syn:
       energy, vim, vitality]
    3: (biology) a hypothetical force (not physical or chemical)
       once thought by Henri Bergson to cause the evolution and
       development of organisms [syn: life force, vital force,
       vitality, elan vital]
    4: the property of being able to survive and grow; "the vitality
       of a seed" [syn: animation, vitality]

Moby Thesaurus II by Grady Ward, 1.0:

188 Moby Thesaurus words for "vitality":
   alacrity, amperage, animal spirits, animate existence, animation,
   anxiety, anxiousness, appetite, armipotence, authority, avidity,
   avidness, beef, being alive, birth, bite, bitingness, black power,
   breathless impatience, brute force, capersomeness, charge,
   charisma, cheerful readiness, clout, cogence, cogency,
   cohesiveness, coltishness, compulsion, cuttingness, decisiveness,
   demonic energy, dint, drive, durability, duress, dynamism,
   eagerness, effect, effectiveness, effectuality, elan, endurance,
   energy, ergal, esprit, existence, exuberance, flower power, force,
   force majeure, forcefulness, fortitude, forwardness, friskiness,
   frolicsomeness, full blast, full force, gaiety, gamesomeness,
   gayness, get-up-and-go, gust, gusto, guts, gutsiness, haleness,
   hardiness, hardness, having life, heartiness, immortality,
   impatience, impressiveness, incisiveness, influence,
   infrangibility, intensity, intestinal fortitude, keen desire,
   keenness, kinetic energy, lastingness, leatherlikeness, life,
   lifetime, liveliness, living, long life, longevity, lustihood,
   lustiness, main force, main strength, mana, might, might and main,
   mightiness, mordancy, moxie, muscle power, nervosity, nervousness,
   obstinacy, oomph, pep, piss and vinegar, pizzazz, playfulness,
   poignancy, poop, potence, potency, potential energy, potentiality,
   power, power pack, power structure, power struggle, powerfulness,
   prepotency, productiveness, productivity, promptness, puissance,
   pull, punch, push, quickness, readiness, resistance, robustness,
   rollicksomeness, rompishness, ropiness, ruggedness, sinew,
   sinewiness, skittishness, sparkle, spirit, spiritedness, spirits,
   sportiveness, sprightliness, spriteliness, stalwartness, stamina,
   staying power, steam, sticking power, stiffness, stoutness,
   strength, strength of will, strenuousness, stringiness, strong arm,
   strong language, stubbornness, sturdiness, superiority, superpower,
   tenacity, toughness, trenchancy, unbreakability, unbreakableness,
   validity, vehemence, verve, viability, vigor, vigorousness, vim,
   virility, virtue, virulence, viscidity, vivaciousness, vivacity,
   wattage, weight, zest, zestfulness, zing, zip