Definition of volunteer verb from the Oxford Advanced American Dictionary

      

    volunteer

     verb
    verb
    NAmE//ˌvɑlənˈtɪr//
     
    Verb Forms present simple I / you / we / they volunteer
     
    he / she / it volunteers
     
    past simple volunteered
     
    -ing form volunteering
     
     
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  1. 1 [intransitive, transitive] to offer to do something without being forced to do it or without getting paid for it volunteer to do something Jill volunteered to start a petition. volunteer (for/as something) Several staff members volunteered for early retirement. volunteer something (for/as something) He volunteered his services as a driver.
  2. 2[transitive] volunteer something + speech to suggest something or tell someone something without being asked to volunteer advice
  3. 3[intransitive] volunteer (for something) volunteer to do something to join the army, etc. without being forced to to volunteer for military service
  4. 4[transitive] volunteer somebody (for/as something) volunteer somebody to do something to suggest someone for a job or an activity, even though they may not want to do it They volunteered me for the job of interpreter.
See the Oxford Advanced Learner's Dictionary entry: volunteer