Definition of authoritatively in English:

authoritatively

adverb

  • 1In a way that is trusted as being accurate or true; with authority:

    ‘he could speak authoritatively on art, philosophy, literature, history, current affairs’
  • 2In a commanding and self-confident manner that induces respect and obedience:

    ‘she shouted authoritatively, 'Hey you! Drop your weapon, now!'’
    1. 2.1 In an official capacity or with official sanction, and therefore requiring compliance or obedience:
      ‘the correct interpretation of the Convention can be authoritatively expounded only by the Strasbourg court’

Pronunciation

authoritatively

/ɔːˈθɒrətətɪvli/