mind [AS, gemynd] , 1. the part of the brain that is the seat of mental activity and that enables one to know, reason, understand, remember, think, feel, react to, and adapt to external and internal stimuli. 2. the totality of all conscious and unconscious processes of the individual that influence and direct mental and physical behavior. 3. the faculty of the intellect or understanding, in contrast to emotion and will. See also brain, intellect, psyche.