A style developed in the mid 20th century, characterized by simplicity and lack of decoration to the point of starkness. The movement advocated reducing art to the state of non-art by removing nature and culture, resulting in artwork in pure, simple forms and objects placed randomly. The term can be extended to all art, including literature, design, music, visual art, and performance. With specific reference to the visual arts, the term is used to describe an abstract art movement and style, predominantly of sculpture, that flourished in the mid- and late 1960s. With specific reference to music, it refers to a style that emerged in the United States in the 1960s featuring prolonged repetition of short passages and unvarying harmonies.

Source: Art & Architecture Thesaurus

http://vocab.getty.edu/page/aat/300065758