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The primary meaning of "abstractionism" seems to be art, not philosophy. Since this article is unsourced and not much of an improvement over Abstraction#Abstraction used in philosophy anyway, I propose turning it into a redirect to abstract art, probably with a hatnote to that article. Objections? Huon (talk) 22:46, 14 September 2013 (UTC)
"abstractionism" has to distinct meanings
"the principles or practice of creating abstract art"
I'm too tired right now to ferret out what should be here exactly, but barring further sources for that definition, there seems to be no justification for a full article. The dictionary definitions need to be reachable from here, and there need to be pointers to the relevant articles/sections in art and philosophy. The existing content must be preserved in the appropriate place.