any disease of the mind; the psychological state of someone who has emotional or behavioral problems serious enough to require psychiatric intervention
a clear and telling mental image; "he described his mental picture of his assailant"; "he had no clear picture of himself or his world"; "the events left a permanent impression in his mind"
a measure of a person's intelligence as indicated by an intelligence test; the ratio of a person's mental age to their chronological age (multiplied by 100)
the action of alienating; the action of causing to become unfriendly; "his behavior alienated the other students"
(law) the voluntary and absolute transfer of title and possession of real property from one person to another; "the power of alienation is an essential ingredient of ownership"