mental illness

noun
any of the various forms of psychosis or severe neurosis.
Also called mental disorder, mental disease.


Origin:
1960–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
mental disorder
 
n
law (in England, according to the Mental Health Act 1983) mental illness, arrested or incomplete development of mind, psychopathic disorder, or any other disorder or disability of the mind
 
mentally disordered
 
adj

mental illness
 
n
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 10th Edition
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American Heritage
Medical Dictionary

mental disorder n.
See mental illness.

mental illness n.
Any of various disorders characterized chiefly by abnormal behavior or an inability to function socially, including diseases of the mind and personality and certain diseases of the brain. Also called mental disease, mental disorder.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
mental illness   (měn'tl)  Pronunciation Key 
Any of various psychiatric disorders or diseases, usually characterized by impairment of thought, mood, or behavior.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Your anger symptoms are not better accounted for by another mental disorder.
Millions of healthy people could be labeled with a mental disorder and treated with potentially dangerous drugs, some say.
In extreme cases, the expression may be characterized as a mental disorder.
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