Real Dictionary

Cubism
uncountable noun: Cubism is a style of art, begun in the early twentieth century, in which objects are represented as if they could be seen from several different positions at the same time, using many lines and geometric shapes.

cubism in American English
a movement in art, esp. of the early 20th cent., characterized by a separation of the subject into cubes and other geometric forms in abstract arrangements rather than by a realistic representation
noun: a style of painting and sculpture developed in the early 20th century, characterized chiefly by an emphasis on formal structure, the reduction of natural forms to their geometrical equivalents, and the organization of the planes of a represented object in

cubism in British English
noun: a French school of painting, collage, relief, and sculpture initiated in 1907 by Pablo Picasso and Georges Braque, which amalgamated viewpoints of natural forms into a multifaceted surface of geometrical planes