autotelism

from the GNU version of the Collaborative International Dictionary of English.

• noun belief that a work of art is an end in itself or its own justification.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The belief that an entity or event has within itself its own meaning or purpose.
• noun art In literature or art, the belief that a work, having been created, is a justification in and of itself. Poems with a unified rhetorical device to frame the poem in a singular idea.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun belief that a work of art is an end in itself or its own justification