Definition of authoritative adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ɔːˈθɒrətətɪv//
    ; NAmE NAmE//əˈθɔːrəteɪtɪv//
    , NAmE//əˈθɑːrəteɪtɪv//
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  1. 1showing that you expect people to obey and respect you an authoritative tone of voice
  2. 2that you can trust and respect as true and correct the most authoritative book on the subject
  3. Extra examples A very authoritative voice shouted, ‘Get back inside.’ He is credited with writing the most authoritative and up-to-date book on the subject. His tone was clear and authoritative. She began to resent his authoritative manner.
See the Oxford Advanced American Dictionary entry: authoritative