Mondrian, Piet Syllabification: (Mon·dri·an, Piet)Pronunciation: /ˈmôndrēˌän/Definition of Mondrian, Piet (1872–1944), Dutch painter; born Pieter Cornelis Mondriaan. He was a cofounder of the De Stijl movement and the originator of neo-plasticism, one of the earliest and strictest forms of geometric abstract painting. Mondrian, Piet in other Oxford dictionaries Definition of Mondrian, Piet in the British & World English dictionary