Source: Oxford University Press
Term derived from a reference made to ‘geometric schemas and cubes’ by the critic Louis Vauxcelles in describing paintings exhibited in Paris by Georges Braque in November 1908; it is more generally applied not only to work of this period by Braque and Pablo Picasso but also to a range of art produced in France during the later 1900s, the 1910s and the early 1920s and to variants developed in other countries. Although the term is not specifically applied to a style of architecture except in former Czechoslovakia, architects did share painters’ formal concerns regarding the conventions of representation and the dissolution of three-dimensional form (see §II below). Cubism cannot definitively be called either a style, the art of a specific group or even a movement. It embraces widely disparate work; it applies to artists in different milieux; and it produced no agreed manifesto. Yet, despite the difficulties of definition, it has been called the first and the most influential of all movements in 20th-century art.
From Grove Art Online