The real trouble is that Modernism is (quite literally) a term of art, and the phrase just gets batted around by many folk without understanding its context and full connotations.

http://www.artsmia.org/modernism/

So when people try to define the differing social and artistic premises of a later emerging movement in the arts, the term postmodernism comes to have an even sloppier general meaning in the wider community, even if most arts practitioners have a pretty good understanding of what they mean by the coinage.

http://www.iath.virginia.edu/elab/hfl0242.html


But hey, write your own definition, why doncha? ;)

http://www.csse.monash.edu.au/community/postmodern.html