Term applied to architecture of the 20th century that is characterized by a scientifically reasoned but ethical attitude to design, accompanied by a desire to adopt the most rational possible built form in relation to structure and construction. It evolved in reaction against 19th-century eclecticism and the apparent failure of Art Nouveau to replace it, while admiration for the imaginative use of materials and techniques in engineering works of the same century led to a concern with the integrity of style in relation to construction. The term encompasses much of the architecture of the MODERN MOVEMENT and INTERNATIONAL STYLE but has often been confused with FUNCTIONALISM, to which similar origins and implications are often ascribed. In addition to its more general architectural meaning, the term has been applied in a special way to Italian modernism of the 1920s and 1930s (Razionalismo) and, after 1966, still more specifically to the architecture and urban design movement TENDENZA initiated by Aldo Rossi.
See the Abbreviations for further details.




