Definition of

Intervention

(noun, act) care provided to improve a situation (especially medical procedures or applications that are intended to relieve illness or injury)
(noun, act) (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
(noun, act) the act or fact of interposing one thing between or among others
(noun, act) the act of intervening (as to mediate a dispute, etc.)
(noun, communication) a policy of intervening in the affairs of other countries

via WordNet, Princeton University

Synonyms of Intervention

Derivations: intervene

Hyponyms: acupressure, acupuncture, autogenic therapy, autogenic training, autogenics, chiropractic, detoxification, fomentation, g-jo, hydropathy, hydrotherapy, intermediation, massage, mediation, medical aid, medical care, modality, naprapathy, naturopathy, orthodontic treatment, orthoptics, osteoclasis, osteopathy, rest-cure, shiatsu, stylostixis

Hypernyms: aid, attention, care, emplacement, engagement, foreign policy, involution, involvement, legal proceeding, locating, location, participation, placement, position, positioning, proceeding, proceedings, tending

early 15c., from L.L. interventionem (nom. interventio) "an interposing," noun of action from pp. stem of L. intervenire "to come between, interrupt," from inter- "between" + venire "come" (see venue). more

Intervention on Wikipedia

Intervention on Wiktionary

Intervention on Google