The Collaborative International Dictionary of English v.0.48:

dynamical \dynamical\ adj. [Narrower terms: can-do; driving;
   energizing, energising, kinetic; forceful, slashing,
   vigorous; projectile; propellant, propellent, propelling,
   propulsive; renascent, resurgent; self-propelled,
   self-propelling; high-octane, high-powered, high-power,
   high-voltage]
   [WordNet 1.5] Dynamically \Dy*nam"ic*al*ly\, adv.
   In accordance with the principles of dynamics or moving
   forces. --J. Peile.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dynamically
    adv 1: in a forceful dynamic manner; "this pianist plays
           dynamically"