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Definition of authoritative adjective from the Oxford Advanced American Dictionary

      

    authoritative

     adjective
    adjective
    NAmE//əˈθɔrəˌteɪt̮ɪv//
     
    , NAmE//əˈθɑrəˌteɪt̮ɪv//
     
     
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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
authoritatively adverb
 
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See authoritative in the Oxford Advanced Learner's Dictionary