Real Dictionary

International Style in American English
a style of modern architecture characterized by boxlike structure, little or no decoration, and smooth, flat surfaces of stone, concrete, glass, etc.
noun: the general form of architecture developed in the 1920s and 1930s by Gropius, Le Corbusier, Mies van der Rohe, and others, characterized by simple geometric forms, large untextured, often white, surfaces, large areas of glass, and general use of steel or

International Style in British English
noun: a 20th-century architectural style characterized by undecorated rectilinear forms and the use of glass, steel, and reinforced concrete