An intervention is defined as action taken to improve a situation, especially a medical disorder. This can mean many different things depending on the context of the word. Typically, an intervention is commonly thought of as a time when a group of people get together in order to intervene on behalf of a loved one, usually an addict or alcoholic. However, that's not the only definition for the term intervention.
An intervention in the therapeutic sense is a term used to encompasses the specific treatment strategies, therapies, or techniques that are used to treat one or more disorders. Interventions of this kind may include psychopharmacology, individual or group counseling, Cognitive-Behavioral Therapy (CBT), 12-step fellowship meetings, case management, skills training, or other strategies.