theoretically

from WordNet (r) 3.0 (2006)

theoretically
    adv 1: in theory; according to the assumed facts; "on paper the
           candidate seems promising"
    2: in a theoretical manner; "he worked the problem out
       theoretically" [ant: {by trial and error}, {empirically},
       {through empirical observation}]

from The Collaborative International Dictionary of English v.0.48

Theoretic \The`o*ret"ic\, Theoretical \The`o*ret"ic*al\, a. [Gr.
   ?: cf. L. theoreticus, F. th['e]or['e]tique.]
   Pertaining to theory; depending on, or confined to, theory or
   speculation; speculative; terminating in theory or
   speculation: not practical; as, theoretical learning;
   theoretic sciences. -- {The`o*ret"ic*al*ly}, adv.
   [1913 Webster]