Term adopted by the French painter Robert Delaunay (1885-1941) from an 1839 publication by color theorist MICHEL EUGENE CHEVREUL (1786-1889).
Delaunay sought to create an abstract art that was dependent on color alone to suggest form and movement. Simultaneity became crucial in the arts just before World War I. Multiple awareness, knowledge of things happening concurrently, and the concept of the continuous present were its key features.
M E Chevreul, De la loi du contraste simultane des couleurs et de I'assortment des objets colores (1839)
R Delaunay, Du cubisme a Vl'art abstrait. Documents inedits, P Francastel, ed. (Paris), 157