behavioralism Syllabification: (be·hav·ior·al·ism)Pronunciation: /biˈhāvyərəˌlizəm/Definition of behavioralism noun the methods and principles of the science of animal (and human) behavior. advocacy of or adherence to a behavioral approach to social phenomena. Derivatives behavioralist noun & adjective behavioralism in other Oxford dictionaries Definition of behavioralism in the British & World English dictionary