abstract - Dictionary definition and meaning for word abstract
abstract: sounds close to retract....and you cant retract anything from an abstract speech or passage.
Ab..A(NOT)+stract(EXTRACT)..(here it means..to gain an information from something)....so if you are a given passage on philosophy,will you be able to understand something,as it very much theoretical and based on general ideas.
abstract-means theoretical or not concrete. think of the movie "Star Trek" - that is purely a non- concrete concept...
Focus on "Tract" (actual word) means a passage in the body/tube and area of wide extent: this is a place for the theories/philosophies of this world.