Definition of authoritatively adverb from the Oxford Advanced Learner's Dictionary

     

    authoritatively

     adverb
    adverb
    BrE BrE//ɔːˈθɒrətətɪvli//
     
    ; NAmE NAmE//əˈθɔːrəteɪtɪvli//
     
    , NAmE//əˈθɑːrəteɪtɪvli//
     
     
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  1. 1in a way that shows you expect people to respect or obey you He authoritatively stated that classic literature was irrelevant to the poor.
  2. 2in a way that can be trusted as true and correct She can speak authoritatively on these issues.