Definition of auxiliary noun from the Oxford Advanced American Dictionary

     

    auxiliary

     noun
    noun
    NAmE//ɔɡˈzɪlyəri//
     
    , NAmE//ɔɡˈzɪləri//
     
    (pl. auxiliaries)
     
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  1. 1(also auxiliary verb) (grammar) a verb such as be, do, and have used with main verbs to show tense, etc. and to form questions, and negatives In the question “Do you know where he has gone?”, “do” and “has” are auxiliaries.
  2. 2 an individual worker or a group of workers who gives help or support to the main group of workers nursing auxiliaries
See the Oxford Advanced Learner's Dictionary entry: auxiliary