Source : Webster's Revised Unabridged Dictionary (1913)

Superscript \Su"per*script\, n.
   Superscription. [Obs.] ``I will overglance the superscript.''
   --Shak.

Source : WordNet®

superscript
     adj : written or printed above and to one side of another
           character [syn: {superior}] [ant: {subscript}, {adscript}]

superscript
     n : a character or symbol set or printed or written above and
         immediately to one side of another character [syn: {superior}]
         [ant: {subscript}]