Abstract Expressionism Abstract Expressionism /ˈæbstrækt ɪkˈsprɛʃənˌɪzəm/

noun

1. () A New York school of painting characterized by freely created abstractions; the first important school of American painting to develop independently of European styles  ( action painting , Abstract Expressionism )
   a New York school of painting characterized by freely created abstractions; the first important school of American painting to develop independently of European styles