The Collaborative International Dictionary of English v.0.48:

Strategy \Strat"e*gy\, n. [Gr. ?: cf. F. strat['e]gie. See
   Stratagem.]
   1. The science of military command, or the science of
      projecting campaigns and directing great military
      movements; generalship.
      [1913 Webster]

   2. The use of stratagem or artifice.
      [1913 Webster]

WordNet (r) 3.0 (2006):

strategy
    n 1: an elaborate and systematic plan of action [syn: scheme,
         strategy]
    2: the branch of military science dealing with military command
       and the planning and conduct of a war