Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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