In a manner relating to behavior; from the perspective of how someone acts or conducts themselves.
From behavior + -al (adjectival suffix) + -ly (adverbial suffix). The suffix chain creates an adverb meaning 'in terms of behavior' or 'with respect to actions.'
Behaviorally is a technical word beloved by psychologists and scientists—when you see '-ally' stacked with '-al,' it signals that you're probably reading academic or scientific prose trying to be very precise about scope.
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