Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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obsessive-compulsive of or relating to having unwanted and uncontrollable thoughts (obsessions), and engaging in repetitive and uncontrollable behaviors (compulsions). [3 definitions]
obsessive-compulsive disorder a mental disorder characterized by having unwanted and uncontrollable thoughts (obsessions), and/or engaging in repetitive and uncontrollable behaviors (compulsions); OCD.
obsessive-compulsive neurosis an emotional disorder characterized by compulsions, irresistible urges, or both, and often manifested in ritualistic behavior.