Source : Webster's Revised Unabridged Dictionary (1913)

Valhalla \Val*hal"la\, n. [Icel. valh["o]ll, literally, hall of
   the slain; valr the slain (akin to AS. w[ae]l, OHG. wal
   battlefield, wuol defeat, slaughter, AS. w[=o]l pestilence) +
   h["o]ll a royal hall. See {Hall}, and cf. {Walhalla}.]
   [Written also {walhalla}.]
   1. (Scand. Myth.) The palace of immortality, inhabited by the
      souls of heroes slain in battle.

   2. Fig.: A hall or temple adorned with statues and memorials
      of a nation's heroes; specifically, the Pantheon near
      Ratisbon, in Bavaria, consecrated to the illustrious dead
      of all Germany.

Source : WordNet®

Valhalla
     n : (Norse mythology) the hall in which Odin received the souls
         of slain heroes [syn: {Walhalla}]