aesthetics
Concise Oxford English Dictionary © 2008 Oxford University Press:
aesthetics /ɛsˈθɛtɪks/ (US also esthetics)
▶plural noun [usu. treated as sing.] a set of principles concerned with the nature and appreciation of beauty, especially in art.
■ the branch of philosophy which deals with questions of beauty and artistic taste.
'aesthetics' also found in these Oxford entries:

