n. (pl. -ies) 1 the scientific study of the human mind and its functions, esp. those affecting behaviour in a given context. 2 a treatise on or theory of this. 3 a the mental characteristics or attitude of a person or group. b the mental factors governing a situation or activity (the psychology of crime). psychologist n. psychologize v.tr. & intr. (also -ise).
[ mod.L psychologia (as PSYCHO-, -LOGY) ]