Shelley, James. "The Concept of the Aesthetic." STANFORD ENCYCLOPEDIA OF PHILOSOPHY September 11, 2009.

Introduced into the philosophical lexicon during the Eighteenth Century, the term "aesthetic" has come to be used to designate, among other things, a kind of object, a kind of judgment, a kind of attitude, a kind of experience, and a kind of value. For the most part, aesthetic theories have divided over questions particular to one or another of these designations: whether artworks are necessarily aesthetic objects; how to square the allegedly perceptual basis of aesthetic judgments with the fact that we give reasons in support of them; how best to capture the elusive contrast between an aesthetic attitude and a practical one; whether to define aesthetic experience according to its phenomenological or representational content; how best to understand the relation between aesthetic value and aesthetic experience. But questions of more general nature have lately arisen, and these have tended to have a skeptical cast: whether any use of "aesthetic" may be explicated without appeal to some other; whether agreement respecting any use is sufficient to ground meaningful theoretical agreement or disagreement; whether the term ultimately answers to any legitimate philosophical purpose that justifies its inclusion in the lexicon. The skepticism expressed by such general questions did not begin to take hold until the later part of the Twentieth Century, and this fact prompts the question whether (a) the concept of the aesthetic is inherently problematic and it is only recently that we have managed to see that it is, or (b) the concept is fine and it is only recently that we have become muddled enough to imagine otherwise. Adjudicating between these possibilities requires a vantage from which to take in both early and late theorizing on aesthetic matters. Read the whole entry here: http://plato.stanford.edu/entries/aesthetic-concept/.