behaviorism be·hav·ior·ism (bĭ-hāv'yə-rĭz'əm)
n.
A school of psychology that confines itself to the study of observable and quantifiable aspects of behavior and excludes subjective phenomena, such as emotions or motives. Also called behavioral psychology.
A theory that psychology is essentially a study of external human behavior rather than internal consciousness and desires. (See B. F. Skinner)