An intervention is the act of inserting one thing between others, like a person trying to help. You could be the subject of a school intervention if your teachers call your parents about the bad grades you've been hiding.

Intervention comes from the Latin intervenire, meaning "to come between, interrupt." Often an intervention is intended to make things better, like the US government's intervention to give food and aid to Haiti after the earthquake. One common use of the word refers to a specific type of meeting, or intervention, that happens with the family and friends of a drug addict; they join together to try to convince the drug user to change their ways and live a healthier life.

Definitions of intervention
  1. noun
    the act or fact of interposing one thing between or among others
    synonyms: interposition
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    type of:
    emplacement, locating, location, placement, position, positioning
    the act of putting something in a certain place
  2. noun
    (law) a proceeding that permits a person to enter into a lawsuit already in progress; admission of person not an original party to the suit so that person can protect some right or interest that is allegedly affected by the proceedings
    “the purpose of intervention is to prevent unnecessary duplication of lawsuits”
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    type of:
    legal proceeding, proceeding, proceedings
    (law) the institution of a sequence of steps by which legal judgments are invoked
  3. noun
    the act of intervening (as to mediate a dispute, etc.)
    “it occurs without human intervention
    synonyms: intercession
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    intermediation, mediation
    the act of intervening for the purpose of bringing about a settlement
    mediation in order to bring about a marriage between others
    type of:
    engagement, involution, involvement, participation
    the act of sharing in the activities of a group
  4. noun
    a policy of intervening in the affairs of other countries
    synonyms: interference
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    noninterference, nonintervention
    a foreign policy of staying out of other countries' disputes
    type of:
    foreign policy
    a policy governing international relations
  5. noun
    care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury)
    synonyms: treatment
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    medical aid, medical care
    professional treatment for illness or injury
    kneading and rubbing parts of the body to increase circulation and promote relaxation
    a method of therapy that involves physical or electrical therapeutic treatment
    a treatment for addiction to drugs or alcohol intended to remove the physiological effects of the addictive substances
    a method of treatment that manipulates body structures (especially the spine) to relieve low back pain or even headache or high blood pressure
    application of warm wet coverings to a part of the body to relieve pain and inflammation
    a method of treating disease using food and exercise and heat to assist the natural healing process
    a drugless method of treatment based on the belief that disease symptoms arise from problems with ligaments and connective tissues
    orthodontic treatment
    dental treatment that corrects irregularities of the teeth or of the relation of the teeth to surrounding anatomy; treatment is usually by braces or mechanical aids
    treatment of defects of binocular vision (such as strabismus and amblyopia) by nonsurgical measures (especially by exercises to strengthen the eye muscles)
    therapy based on the assumption that restoring health is best accomplished by manipulating the skeleton and muscles
    treatment of a skeletal deformity by intentionally fracturing a bone
    acupuncture, stylostixis
    treatment of pain or disease by inserting the tips of needles at specific points on the skin
    G-Jo, acupressure, shiatsu
    treatment of symptoms by applying pressure with the fingers to specific pressure points on the body
    autogenic therapy, autogenic training, autogenics
    training patients in self-induced relaxation
    hydropathy, hydrotherapy
    the internal and external use of water in the treatment of disease
    rest as a medical treatment for stress or anxiety etc.
    the act of rubbing down, usually for relaxation or medicinal purposes
    primary care
    the medical care received on first contact with the medical system (before being referred elsewhere)
    care and treatment of a convalescent patient
    hospital care, hospitalisation, hospitalization
    placing in medical care in a hospital
    cardiac massage, heart massage
    an emergency procedure that employs rhythmic compression of the heart (either through the chest wall or, during surgery, directly to the heart) in an attempt to maintain circulation during cardiac arrest
    a rhythmic stroking
    massage of the skin which is gently lifted and squeezed
    massage to relieve tension by finger pressure; based on the belief that there are reflex points on the feet, hands, and head that are connected to every part of the body
    Swedish massage
    massage combined with a system of active and passive exercises for the muscles and joints
    massage in which the body is tapped rhythmically with the fingers or with short rapid movements of the sides of the hand; used to loosen mucus on the chest walls of patients with bronchitis
    (medicine) the act of caring for someone (as by medication or remedial training etc.)
    a method of physical therapy that involves generating local heat in body tissues by high-frequency electromagnetic currents
    nursing care
    care by a skilled nurse
    (medicine) cleaning a wound or body organ by flushing or washing out with water or a medicated solution
    bandaging, binding, dressing
    the act of applying a bandage
    holistic medicine
    medical care of the whole person considered as subject to personal and social as well as organic factors
    a program of medical and emotional care for the terminally ill
    injection, shot
    the act of putting a liquid into the body by means of a syringe
    formerly used as a treatment to reduce excess blood (one of the four humors of medieval medicine)
    treatment by stopping fibrillation of heart muscles (usually by electric shock delivered by a defibrillator)
    treatment for poisoning by neutralizing the toxic properties (normally a function of the liver)
    treatment to destroy harmful microorganisms
    digitalisation, digitalization
    the administration of digitalis for the treatment of certain heart disorders
    the administration of an anticoagulant drug to retard coagulation of the blood
    the usual method of treating disease with remedies that produce effects differing from those produced by the disease itself
    homeopathy, homoeopathy
    a method of treating disease with small amounts of remedies that, in large amounts in healthy people, produce symptoms similar to those being treated
    intensive care
    close monitoring and constant medical care of patients with life-threatening conditions
    type of:
    aid, attention, care, tending
    the work of providing treatment for or attending to someone or something
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