ˌabstract exˈpressionismBrE NAmE noun [uncountable]a style and movement in abstract art that developed in New York in the middle of the 20th century and tries to express the feelings of the artist rather than showing a physical object ˌabstract exˈpressionist /BrE ; NAmE / nounabstract expressionists like Jackson Pollock ˌabstract exˈpressionist /BrE ; NAmE / adjective [usually before noun]abstract expressionist art