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):

strategic
    adj 1: relating to or concerned with strategy; "strategic
           weapon"; "the islands are of strategic importance";
           "strategic considerations" [syn: strategic,
           strategical]
    2: highly important to or an integral part of a strategy or plan
       of action especially in war; "a strategic chess move";
       "strategic withdrawal"; "strategic bombing missions"

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "strategic":
   Machiavellian, Machiavellic, acute, arch, arranged, artful, astute,
   blueprinted, cagey, calculated, canny, cardinal, charted, clever,
   contrived, crafty, critical, crucial, cunning, cute, deceitful,
   deep, deep-laid, designed, designing, devised, diplomatic, feline,
   figured, foxy, guileful, in the works, ingenious, insidious,
   inventive, key, knowing, methodized, on the agenda, on the anvil,
   on the calendar, on the carpet, on the docket, on the tapis,
   organized, pawky, planned, plotted, politic, principal, projected,
   rationalized, ready, resourceful, scheduled, schematized, scheming,
   serpentine, set, shaped, sharp, shifty, shrewd, slick, slippery,
   sly, smooth, snaky, sneaky, sophistical, stealthy, strategetic,
   subtile, subtle, supple, sur le tapis, systematized, tactical,
   trickish, tricksy, tricky, vital, vulpine, wary, wily,
   worked out