
Obsessive–compulsive disorder affects children and adolescents, as well as adults. Roughly one third to one half of adults with OCD report a childhood onset of the disorder, suggesting the continuum of anxiety disorders across the lifespan. The phrase obsessive–compulsive has become part of the English lexicon, and is often used in an informal...
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http://en.wikipedia.org/wiki/Obsessive–compulsive_disorder

type of mental disorder in which an individual experiences obsessions or compulsions or both. Either the obsessive thought or the compulsive act may ... [6 related articles]
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http://www.britannica.com/eb/a-z/o/3

An anxiety disorder in which a person has intrusive ideas, thoughts, or images that occur repeatedly, and in which he or she feels driven to perform certain behaviors over and over again. For example, a person may worry all the time about germs and so will wash his or her hands over and over again. Having an obsessive-compulsive disorder may cause ...
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http://www.cancer.gov/dictionary?expand=O

Anxiety disorder where an individual has to perform specific actions such as washing. These activities may reach such proportions that the individual's entire life is centred upon them.
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An anxiety disorder characterised by recurrent, persistent obsessions or compulsions. Obsessions are the intrusive ideas, thoughts, or images that are experienced as senseless or repugnant. Compulsions are repetitive and seemingly purposeful behaviour which the individual generally recognises as senseless and from which the individual does not deri...
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http://www.encyclo.co.uk/local/20973

(OCD) an anxiety disorder characterized by recurrent obsessions and compulsions that are severe enough to interfere significantly with personal or social functioning. Performing compulsive rituals may release tension temporarily, and resisting them causes increased tension. This disorder is not the same as obsessi...
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http://www.encyclo.co.uk/local/21001

OCD is a problem characterised by obsessive thoughts and compulsive behaviour. The behaviour can take various forms such as cleaning or checking rituals in which the person will repeatedly clean themselves or their house or check, for example that doors are locked and/or electrical sockets are turned off. Dermatological problems are common in peopl...
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an anxiety disorder in which a person has an unreasonable thought, fear, or worry that he or she tries to manage through a ritualized activity to reduce the anxiety.
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(OCD) Type: Term Definitions: 1. a type of anxiety disorder the essential features of which include recurrent obsessions, persistent intrusive ideas, thoughts, impulses or images, or compulsions (repetitive, purposeful, and intentional behaviors performed to decrease anxiety in response to an obsession) sufficiently severe to cau...
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http://www.medilexicon.com/medicaldictionary.php?t=26031

Obsessive-compulsive disorder: A psychiatric disorder characterized by obsessive thoughts and compulsive actions, such as cleaning, checking, counting, or hoarding. Obsessive-compulsive disorder (OCD), one of the anxiety disorders, is a potentially disabling condition that can persist throughout a person's life. The individual who suffers from OCD ...
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http://www.medterms.com/script/main/art.asp?articlekey=4610

(OCD) Obsessive Compulsive Disorder is a chronic, relapsing illness. People who have it suffer from recurrent and unwanted thoughts or rituals. The obsessions and the need to perform rituals can take over a person's life if left untreated. They feel they cannot control these thoughts or rituals.
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http://www.wamhinpc.org.uk/glossary-of-mental-health-terms

Obsessive Compulsive Disorder is a chronic, relapsing illness. People who have it suffer from recurrent and unwanted thoughts or rituals. The obsessions and the need to perform rituals can take over a person's life if left untreated. They feel they cannot control these thoughts or rituals.
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http://www.wamhinpc.org.uk/glossary-of-mental-health-terms

A disorder in which individuals are plagued by persistent, recurring thoughts or obsessions that reflect exaggerated anxiety or fears. Typical obsessions include worry about being contaminated or fears of behaving improperly or acting violently. The obsessions may lead to the performance of ritual or routine compulsions such as washing hands, repea...
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https://littleorangefish.org/terms

People with OCD have obsessions and/or compulsions. An obsession refers to recurrent and persistent thoughts, impulses, or images that are intrusive and cause severe anxiety or distress. Compulsions refer to repetitive behaviors and rituals (like hand washing, hoarding, ordering, checking) or mental acts (like counting, repeating words silently, av...
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https://www.bestselfwny.org/resources/glossary-of-mental-health-terms/

Disorder where a person has recurrent unwanted ideas (obsessions) & an urge (compulsion) to do something to relieve the obsession.
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a mental disorder in which a person is obsessed with certain thoughts, leading them to repeatedly perform specific acts; for example, constantly washing the hands out of fear of germs and dirt
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https://www.encyclo.co.uk/local/20875
noun an anxiety disorder characterized by recurrent and persistent thoughts and feelings and repetitive, ritualized behaviors
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https://www.encyclo.co.uk/local/20974

In psychiatry, anxiety disorder that manifests itself in the need to check constantly that certain acts have been performed `correctly`. Sufferers may, for example, feel compelled to wash themselves repeatedly or return home again and again to check that doors have been locked and appliances switched off. They may also hoard certain objec...
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https://www.encyclo.co.uk/local/21221
(OCD) A mental disorder characterized by obsessions-recurrent thoughts, images, or impulses that recur or persist despite efforts to suppress them-and compulsions-repetitive, purposeful acts performed according to certain rules or in a ritualized manner.
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https://www.encyclo.co.uk/local/22842

A disorder involving obsessions, compulsions, or both.
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https://www.sparknotes.com/psychology/psych101/glossary/terms/
(OCD) an anxiety disorder in which a person has an unreasonable thought, fear, or worry that he/she tries to manage through a ritualized activity to reduce the anxiety. Frequently occurring disturbing thoughts or images are called obsessions, and the rituals performed to try to prevent or dispel them are called compulsions.
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https://www.stanfordchildrens.org/en/topic/default?id=glossary---child-and-
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