Source : Webster's Revised Unabridged Dictionary (1913)

Nirvana \Nir*va"na\, n. [Skr. nirv[=a][.n]a.]
   In the Buddhist system of religion, the final emancipation of
   the soul from transmigration, and consequently a beatific
   enfrachisement from the evils of wordly existence, as by
   annihilation or absorption into the divine. See {Buddhism}.

Source : WordNet®

Nirvana
     n 1: (Hinduism and Buddhism) the beatitude that transcends the
          cycle of reincarnation; characterized by the extinction
          of desire and suffering and individual consciousness
          [syn: {enlightenment}]
     2: any place of complete bliss and delight and peace [syn: {eden},
         {paradise}, {heaven}, {promised land}, {Shangri-la}]