Disorder may refer to randomness, a lack of intelligible pattern, or:
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disorder in Wiktionary, the free dictionary.
- Disorder (medicine), a functional abnormality or disturbance
- Mental disorder or psychological disorder, a psychological pattern associated with distress or disability that occurs in a person and is not a part of normal development or culture:
- Anxiety disorder, different forms of abnormal and pathological fear and anxiety
- Conversion disorder, neurological symptoms such as numbness, blindness, paralysis, or fits, where no neurological explanation is possible
- Obsessive–compulsive disorder, an anxiety disorder characterized by repetitive behaviors aimed at reducing anxiety
- Obsessive–compulsive personality disorder, obsession with perfection, rules, and organization
- Personality disorder, an enduring pattern of inner experience and behavior that deviates markedly from the expectations of the culture of the person who exhibits it