Definition of intervene verb from the Oxford Advanced American Dictionary

      

    intervene

     verb
    verb
    NAmE//ˌɪntərˈvin//
     
    Verb Forms present simple I / you / we / they intervene
     
    he / she / it intervenes
     
    past simple intervened
     
    -ing form intervening
     
     
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  1. 1[intransitive] to become involved in a situation in order to improve or help it She might have been killed if the neighbors hadn't intervened. intervene in something The President intervened personally in the crisis.
  2. 2[transitive, intransitive] (+ speech) to interrupt someone when they are speaking in order to say something “But,” she intervened, “what about the others?”
  3. 3[intransitive] to happen in a way that delays something or prevents it from happening They were planning to get married and then the war intervened.
  4. 4[intransitive] (formal) to exist between two events or places I saw nothing of her during the years that intervened.
 intervention
 
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NAmE//ˌɪntərˈvɛnʃn//
 
noun [uncountable, countable] intervention (in something) calls for government intervention to save the steel industry armed/military intervention People resented his repeated interventions in the debate.
See the Oxford Advanced Learner's Dictionary entry: intervene