1. 
[syn: aesthetic, esthetic, aesthetical, esthetical]
The Collaborative International Dictionary of English v.0.48:
AEsthetic \[AE]s*thet"ic\, AEsthetical \[AE]s*thet"ic*al\, a.
   Of or Pertaining to [ae]sthetics; versed in [ae]sthetics; as,
   [ae]sthetic studies, emotions, ideas, persons, etc.
   [1913 Webster] -- [AE]s*thet"ic*al*ly, adv.
   [1913 Webster]
WordNet (r) 3.0 (2006):
aesthetical
    adj 1: concerning or characterized by an appreciation of beauty
           or good taste; "the aesthetic faculties"; "an aesthetic
           person"; "aesthetic feeling"; "the illustrations made the
           book an aesthetic success" [syn: aesthetic, esthetic,
           aesthetical, esthetical] [ant: inaesthetic,
           unaesthetic]