psychology

n. (pl. -ies) 1 the study of the human mind. 2 treatise on or theory of this. 3 a mental characteristics etc. Of a person or group. B mental aspects of an activity, situation, etc. (psychology of crime).  psychologist n.

n. The science of the human soul; specifically, the systematic or scientific knowledge of the powers and functions of the human soul, so far as they are known by consciousness; a treatise on the human soul.