functionally

from WordNet (r) 3.0 (2006)

functionally
    adv 1: with respect to function; "the two units are functionally
           interdependent"

from The Collaborative International Dictionary of English v.0.48

Functionally \Func"tion*al*ly\, adv.
   In a functional manner; as regards normal or appropriate
   activity.
   [1913 Webster]

         The organ is said to be functionally disordered.
                                                  --Lawrence.
   [1913 Webster]