Obsessive-compulsive disorder is defined as a psychiatric disorder where people have unwanted thoughts or the need to repeat words or actions to the point that it interferes with their normal lives.
An example of obsessive-compulsive disorder is having the need to flick light switches on and off dozens of times in each room.
An example of obsessive-compulsive disorder is having a fear of germs.
Abbr. OCD A psychiatric disorder characterized by the persistent intrusion of certain repetitive, unwanted thoughts, sometimes accompanied by compulsive actions, that a person is unable to prevent and that interfere with normal functioning.