Typically, abstraction is used in the arts as a synonym for abstract art in general.
In the visual arts
Strictly speaking, it refers to art unconcerned with the literal depiction of things from the visible world  -it can, however, refer to an object or image which has been distilled from the real world, or indeed, another work of art. Artwork that reshapes the natural world for expressive purposes is called abstract; that which derives from, but does not include a recognizable subject is called nonobjective abstraction. In the 20th century, the trend toward abstraction coincides with advances in science, technology, and changes in urban life, and eventually reflects an interest in psychoanalytic theory.  Later still, abstraction was manifest in more purely formal terms, such as color, freedom from objective, and a reduction of form to basic geometric designs and shapes.
In music, the term abstraction can be used to describe improvisatory approaches to interpretation, and may sometimes indicate abandonment of tone . Atonal music has no key signature, and is characterized by the exploration of internal numeric relationships. 
- Jump up^ Encyclopædia Britannica
- Jump up^ Catherine de Zegher and Hendel Teicher (eds.),3 X Abstraction. NY / New Haven: The Drawing Center / Yale University Press. 2005.ISBN 0-300-10826-5
- Jump up^ National Gallery of Art: Abstraction. Retrieved 31 January 2013.
- Jump up^ Washington State University: Glossary of Abstraction. Retrieved 31 January 2013.