Source : Webster's Revised Unabridged Dictionary (1913)

Potentially \Po*ten"tial*ly\, adv.
   1. With power; potently. [Obs.]

   2. In a potential manner; possibly, not positively.

            The duration of human souls is only potentially
            infinite.                             --Bentley.

Source : WordNet®

potentially
     adv : with a possibility of becoming actual; "introducing possibly
           dangerous innovations"; "he is potentially dangerous";
           "potentially useful" [syn: {possibly}]