Definition of auxiliary noun from the Oxford Advanced Learner's Dictionary

     

    auxiliary

     noun
    noun
    BrE BrE//ɔːɡˈzɪliəri//
     
    ; NAmE NAmE//ɔːɡˈzɪliəri//
     
    (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. 2a worker who gives help or support to the main group of workers nursing auxiliaries
  3. Word Origin late Middle English: from Latin auxiliarius, from auxilium ‘help’.
See the Oxford Advanced American Dictionary entry: auxiliary