Source: Oxford University Press
International movement in art and architecture, which flourished between c. 1905 and c. 1920, especially in Germany. It also extended to literature, music, dance and theatre. The term was originally applied more widely to various avant-garde movements: for example it was adopted as an alternative to the use of ‘Post-Impressionism’ by Roger Fry in exhibitions in London in 1910 and 1912. It was also used contemporaneously in Scandinavia and Germany, being gradually confined to the specific groups of artists and architects to which it is now applied.
From Grove Art Online