The Collaborative International Dictionary of English v.0.48:
behaviourism \behaviourism\ n. same as behaviorism. Syn: behaviorism, behavioristic psychology, behaviouristic psychology. [WordNet 1.5]WordNet (r) 3.0 (2006):
behaviourism n 1: an approach to psychology that emphasizes observable measurable behavior [syn: behaviorism, behaviourism, behavioristic psychology, behaviouristic psychology]