or chiefly Brit  be*hav*iour  n 1  :  the manner of conducting oneself  2 a  :  anything that an organism does involving action and response to stimulation  b  :  the response of an individual, group, or species to its environment be*hav*ior*al or chiefly Brit  be*hav*iour*al  adj be*hav*ior*al*ly or chiefly Brit  be*hav*iour*al*ly  adv 
 
 
 
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