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mental age an individual's mental ability, measured in terms of the chronological age at which an average person would attain that level of intelligence.
mental health the condition, or degree of health, of one's mind and emotions. [3 definitions]
mental hospital an institution where people with mental illnesses are cared for, given therapy and medical treatment, and sometimes permanently housed, more commonly referred to now as "psychiatric hospital."
mental illness a class of illness that primarily afflicts the mind, thought processes, and emotions rather than the physical body. [3 definitions]
mental math mathematical calculations done by thinking alone.
mental retardation the lack of one or more mental functions since birth, resulting in below-normal intelligence and inability to function adequately, caused by brain damage, disease, or congenital factors; mental deficiency.