Source : Webster's Revised Unabridged Dictionary (1913)

Tactical \Tac"tic*al\, a. [Gr. ?. See {Tactics}.]
   Of or pert. to military or naval tactics; hence, pert. to, or
   characterized by, planning or maneuvering.

Tactic \Tac"tic\, Tactical \Tac"tic*al\, a. [Gr. ?. See
   {tactics}.]
   Of or pertaining to the art of military and naval tactics. --
   {Tac"tic*al*ly}, adv.

Source : WordNet®

tactical
     adj : of or pertaining to tactic or tactics; "a tactical error"