Wordnet 3.0
ADVERB (1)
1. 
 with regard to tactics; 
- Example: "the tactically useful province is still firmly in the rebels' hands"
The Collaborative International Dictionary of English v.0.48:
Tactic \Tac"tic\, Tactical \Tac"tic*al\, a. [Gr. taktiko`s. See
   tactics.]
   Of or pertaining to military or naval tactics; hence,
   pertaining to, or characterized by, planning or maneuvering
   for the short term; -- contrasted with strategic, planning
   for the long term.
   -- Tac"tic*al*ly, adv.
   [Webster 1913 Suppl.]
WordNet (r) 3.0 (2006):
tactically
    adv 1: with regard to tactics; "the tactically useful province
           is still firmly in the rebels' hands"