Definition of authoritative adjective from the Oxford Advanced American Dictionary

      

    authoritative

     adjective
    adjective
    NAmE//əˈθɔrəˌteɪt̮ɪv//
     
    , NAmE//əˈθɑr‑//
     
     
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  1. 1that you can trust and respect as true and correct the most authoritative book on the subject
  2. 2showing that you expect people to obey and respect you an authoritative tone of voice
authoritativelyadverb
 
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See the Oxford Advanced Learner's Dictionary entry: authoritative