a disorder characterized by recurrent intrusive thoughts (obsessions) that prompt the performance of neutralizing rituals (compulsions).

in DSM–IV–TR and DSM–5, a personality disorder characterized by an extreme need for perfection, an excessive orderliness, an inability to compromise, and an exaggerated sense of moral responsibility (see scrupulosity).

in DSM–IV–TR, a behavior disorder of childhood characterized by recurrent disobedient, negativistic, or hostile behavior toward authority figures that is more pronounced than usually seen in children of similar age and lasts for at least 6 months.