The Collaborative International Dictionary of English v.0.48:

Strategic \Stra*te"gic\, Strategical \Stra*te"gic*al\, a. [Gr. ?
   of or for a general: cf. F. strat['e]gique.]
   Of or pertaining to strategy; effected by artifice. --
   Stra*te"gic*al*ly, adv.
   [1913 Webster]

   Strategic line (Mil.), a line joining strategic points.

   Strategic point (Mil.), any point or region in the theater
      or warlike operations which affords to its possessor an
      advantage over his opponent, as a mountain pass, a
      junction of rivers or roads, a fortress, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

strategical
    adj 1: relating to or concerned with strategy; "strategic
           weapon"; "the islands are of strategic importance";
           "strategic considerations" [syn: strategic,
           strategical]