1. An artist who paints or creates art that expresses ideas and emotions by using elements of colors and lines without attempting to create a realistic picture: Lawrence's sister was a well-known abstractionist who was very creative with her unique forms and the blending of colors in her artistic endeavors.
2. Those who do not represent or imitate external reality or the objects of nature: The abstractionists were criticized for not presenting realistic ideas for improving the parks, streets, and other aspects of the city that had been deteriorating for years.