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mental illness

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noun
  1. any of the various forms of psychosis or severe neurosis.

Origin of mental illness

First recorded in 1960–65
Also called mental disorder, mental disease.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for mental disease

mental illness

noun
  1. any of various disorders in which a person's thoughts, emotions, or behaviour are so abnormal as to cause suffering to himself, herself, or other people
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

mental disease in Medicine

mental disease

n.
  1. mental illness

mental illness

n.
  1. Any of various psychiatric conditions, usually characterized by impairment of an individual's normal cognitive, emotional, or behavioral functioning, and caused by physiological or psychosocial factors.mental disease mental disorder

mental disease in Science

mental illness

[mĕntl]
  1. Any of various psychiatric disorders or diseases, usually characterized by impairment of thought, mood, or behavior.

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