[be.hav.ior] n [alter. of ME behavour, fr. behaven] (15c) 1 a: the manner of conducting oneself b: anything that an organism does involving action and response to stimulation c: the response of an individual, group, or species to its environment
2: the way in which someone behaves; also: an instance of such behavior
3: the way in which something functions or operates -- be.hav.ior.al adj -- be.hav.ior.al.ly adv