|1.||the theory of design that the form of a thing should be determined by its use|
|2.||any doctrine that stresses utility or purpose|
|3.||psychol a system of thought based on the premise that all mental processes derive from their usefulness to the organism in adapting to the environment|
An approach to architecture that adapts the design of a building or other structure to its future use. Walter Gropius and Ludwig Mies Van Der Rohe were notable advocates of functionalism in the twentieth century.