The Collaborative International Dictionary of English v.0.48:

AEsthesia \[AE]s*the"si*a\, n. [Gr. ? sensation, fr. ? to
   perceive.] (Physiol.)
   Perception by the senses; feeling; -- the opposite of
   an[ae]sthesia.
   [1913 Webster] AEsthesiometer

WordNet (r) 3.0 (2006):

aesthesia
    n 1: mental responsiveness and awareness [syn: sensibility,
         esthesia, aesthesia] [ant: insensibility]