A doctrine, in several fields, that the function of something should be reflected in its design and the materials used in its construction.
Synonym of functional linguistics
The idea that social and cultural cohesion are a function of the interdependence and interactions of the institutions of a society.
A general school of thought that considers psychological phenomena in terms of their role in adaptation to the person's environment.
The definition of mental states in terms of their causes and effects.
The ability to do a task, performance, or execution; a set of functions that something is able or equipped to perform.
The presence of a functional group.
In United States trademark law, the tendency of a product design to serve a function other than identification of the product, preventing that design from being protected as a trademark.