“Multiples: Works of art theoretically made in unlimited numbers—in contrast with works made in traditional editions—which are slightly altered in style from their originals. Multiples by Alexander Calder, Claes Oldenburg, and others were introduced in the 1960s, when they were promoted by private art galleries.”
Excerpted from: Diamond, David G. The Bulfinch Pocket Dictionary of Art Terms. Boston: Little Brown, 1992.