The Collaborative International Dictionary of English v.0.48:

Well-being \Well"-be`ing\, n.
   The state or condition of being well; welfare; happiness;
   prosperity; as, virtue is essential to the well-being of men
   or of society.
   [1913 Webster]

WordNet (r) 3.0 (2006):

well-being
    n 1: a contented state of being happy and healthy and
         prosperous; "the town was finally on the upbeat after our
         recent troubles" [syn: wellbeing, well-being,
         welfare, upbeat, eudaemonia, eudaimonia] [ant:
         ill-being]

Moby Thesaurus II by Grady Ward, 1.0:

102 Moby Thesaurus words for "well-being":
   Easy Street, Hygeia, abundance, acceptance, advantage, affluence,
   amusement, animal pleasure, avail, bed of roses, behalf, behoof,
   benefit, benison, blessing, bloom, bodily pleasure, boon,
   carnal delight, clover, comfort, composure, content, contentedness,
   contentment, coziness, creature comforts, ease, easy circumstances,
   easy street, emotional health, endpleasure, enjoyment,
   entertainment, entire satisfaction, euphoria, felicity, fitness,
   fleshpots, flush, forepleasure, fruition, fulfillment, fun, gain,
   glow, good, gracious life, gracious living, gratification,
   great satisfaction, gusto, happiness, health, hearty enjoyment,
   intellectual pleasure, interest, joie de vivre, keen pleasure,
   kicks, lap of luxury, life of ease, loaves and fishes, luxury,
   mental health, peace of mind, physical condition, physical fitness,
   physical pleasure, pleasure, profit, prosperity, prosperousness,
   quiet pleasure, reconcilement, reconciliation, relish, resignation,
   rosiness, satisfaction, security, self-gratification,
   self-indulgence, sensual pleasure, sensuous pleasure,
   sexual pleasure, solid comfort, success, sweetness of life,
   the affluent life, the good life, thriving, thriving condition,
   titillation, upward mobility, velvet, voluptuousness, weal, wealth,
   welfare, world of good, zest