Definition of behaviourist noun from the Oxford Advanced Learner's Dictionary

 

behaviourist

 noun
(especially US English behaviorist)noun
BrE BrE//bɪˈheɪvjərɪst//
 
; NAmE NAmE//bɪˈheɪvjərɪst//
 
(psychology)
 
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a scientist who studies or accepts the theory of behaviourism