The Collaborative International Dictionary of English v.0.48:
Cubism \Cu"bism\ (k[=u]"b[i^]z'm), n. (Painting) A movement or phase in post-impressionism (which see, below). -- Cu"bist, n. [Webster 1913 Suppl.]WordNet (r) 3.0 (2006):
cubism n 1: an artistic movement in France beginning in 1907 that featured surfaces of geometrical planes