functionalism

n.	1.	a psychology based on the assumption that all mental process are useful to an organism in adapting to the environment.
	2.	any doctrine that stresses utility or purpose.

Noun	1.	functionalism - a psychology based on the assumption that all mental process are useful to an organism in adapting to the environment
	2.	functionalism - any doctrine that stresses utility or purpose

psychological science, psychology, scientific theory