Толковый словарь английского языка Oxford English Reference - behaviour

n. (US behavior) 1 a the way one conducts oneself; manners. b the treatment of others; moral conduct. 2 the way in which a ship, machine, chemical substance, etc., acts or works. 3 Psychol. the response (of a person, animal, etc.) to a stimulus. Phrases and idioms behaviour therapy the treatment of neurotic symptoms by training the patient's reactions (see BEHAVIOURISM). be on one's good (or best) behaviour behave well when being observed. Etymology: BEHAVE after demeanour and obs. haviour f. have