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behavioralist

noun
be·​hav·​ior·​al·​ist | \bi-ˈhā-vyə-rə-list, bē-\
variants: or British behaviouralist \ bi-​ˈhā-​vyə-​rə-​list , bē-​ \
plural -s

Definition of behavioralist 

: one who studies, accepts, or observes the point of view of behavioristics

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