Webster's English Dictionary

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vitality

vi.tal.i.ty \vi--'tal-*t-e-\ n 1a: the peculiarity distinguishing the 
   living from the nonliving  1b: capacity to live and develop; also : 
   physical or mental vigor e sp. when highly developed 2a: power of enduring 
   or continuing  2b: lively and animated character : VIGOR