'Theoretically' definitions:

Definition of 'theoretically'

(from WordNet)
adverb
In theory; according to the assumed facts; "on paper the candidate seems promising"
adverb
In a theoretical manner; "he worked the problem out theoretically" [ant: by trial and error, empirically, through empirical observation]

Definition of 'Theoretically'

From: GCIDE
  • 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]