"abstractionism" has to distinct meanings
 "the principles or practice of creating abstract art"
 "the presentation of ideas in an abstract manner"
 My impression from looking around is that there clearly needs to be an article abstraction (philosophy)
 http://www.philosophyideas.com/files/papers/Geach%20on%20Abstraction.pdf
 http://155.97.32.9/~phanna/classes/ling5981/autumn03/web/webnotes/8sept/node3.html
 http://www.calstatela.edu/faculty/tbettch/458HandoutTwo.htm
 http://www.authorama.com/meaning-of-truth-14.html
 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.