The Collaborative International Dictionary of English v.0.48:

Austerlitz \Austerlitz\ n.
   a decisive battle during the Napoleonic campaigns (1805); the
   French under Napoleon defeated the Russian and Austrian
   armies of Czar Alexander I and Emperor Francis II.

   Syn: battle of Austerlitz.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Austerlitz
    n 1: a town in Czech Republic; site of the battle of Austerlitz
         in 1805
    2: a decisive battle during the Napoleonic campaigns (1805); the
       French under Napoleon defeated the Russian armies of Czar
       Alexander I and the Austrian armies of Emperor Francis II
       [syn: Austerlitz, battle of Austerlitz]