neoplasticism Syllabification: (ne·o·plas·ti·cism)Pronunciation: /ˌnēōˈplastiˌsizəm/Definition of neoplasticism noun a style of abstract painting developed by Piet Mondrian, using only vertical and horizontal lines and rectangular shapes in black, white, gray, and primary colors. Origin: 1920s: coined by Piet Mondrianneoplasticism in other Oxford dictionaries Definition of neoplasticism in the British & World English dictionary