British spelling: in a manner relating to behavior; from the perspective of behavioral characteristics or conduct.
British English variant of 'behaviorally,' using 'behaviour' (British spelling) + -ally. The -our ending is characteristic of British spelling conventions for this Latin-origin word.
Behaviourally versus behaviorally shows the Great Vowel Split between American and British English—it's purely spelling, not pronunciation, but it signals which side of the Atlantic you're reading from.
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