Behavior is the preferred spelling in American English. Behaviour is preferred everywhere else. Other than the spelling, there is no difference between the two words. The spelling distinction extends to all derivatives, including behaviors–behaviours, behavioral–behavioural, and behaviorally–behaviourally.

Is there a word behaviorally?

be·hav′ior·al adj. be·hav′ior·al·ly adv. These nouns all pertain to a person's actions as they constitute a means of evaluation by others.

Is Behaviour a British spelling?

behaviour Add to list Share. Your behaviour is the way you act in various situations. Note that this word ends with "our," which is the British spelling, while the American English spelling is behavior.