Definition of intervene verb from the Oxford Advanced Learner's Dictionary

      

    intervene

     verb
    verb
    BrE BrE//ˌɪntəˈviːn//
     
    ; NAmE NAmE//ˌɪntərˈviːn//
     
    Verb Forms present simple I / you / we / they intervene
    BrE BrE//ˌɪntəˈviːn//
     
    ; NAmE NAmE//ˌɪntərˈviːn//
     
    he / she / it intervenes
    BrE BrE//ˌɪntəˈviːnz//
     
    ; NAmE NAmE//ˌɪntərˈviːnz//
     
    past simple intervened
    BrE BrE//ˌɪntəˈviːnd//
     
    ; NAmE NAmE//ˌɪntərˈviːnd//
     
    past participle intervened
    BrE BrE//ˌɪntəˈviːnd//
     
    ; NAmE NAmE//ˌɪntərˈviːnd//
     
    -ing form intervening
    BrE BrE//ˌɪntəˈviːnɪŋ//
     
    ; NAmE NAmE//ˌɪntərˈviːnɪŋ//
     
     
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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 neighbours hadn't intervened. intervene in something The President intervened personally in the crisis.
  2. 2[transitive, intransitive] (+ speech) to interrupt somebody 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.
  5. Word Origin late 16th cent. (in the sense ‘come in as an extraneous factor or thing’): from Latin intervenire, from inter- ‘between’ + venire ‘come’.Extra examples Eventually, the army was forced to intervene. Government often intervenes decisively in major professional issues in medicine. Intervening militarily will not bring peace. Local people feel strongly about the proposed development but are virtually powerless to intervene. Nurses should be ready to intervene on behalf of their patients. Our government has no right to intervene. She was reluctant to intervene in what was essentially a private dispute. She went over to intervene between the two men. The King intervened personally on behalf of the children. The UN refused to intervene. They would not intervene against the rebels themselves. attempts to intervene with the authorities on the prisoners’ behalf She might have been killed if the neighbours hadn’t intervened. Teachers should learn when to intervene and when to let the students do the talking. The EU refuses to intervene to control the trade.
See the Oxford Advanced American Dictionary entry: intervene