Genre of visual arts in which figurative subjects or other forms are simplified or changed in their representation so that they do not portray a recognizable person, object, thing, etc.; may reference an idea, quality, or state rather than a concrete object. For the process of formulating general concepts by abstracting common properties of instances, prefer "abstraction." For 20th-century art styles that were a reaction against the traditional European conception of art as the imitation of nature, use "Abstract (fine arts style)."

Source: Art & Architectute Thesaurus

http://vocab.getty.edu/page/aat/300417511