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Adjective: authoritative  u'thó-ri,tey-tiv [N. Amer], o'thó-ri-tu-tiv [Brit]
  1. Having authority, ascendancy or influence
    "the captain's authoritative manner";
    - important
  2. Of recognized authority or excellence
    - definitive
  3. Sanctioned by established authority
    "an authoritative communiqué";
    - authorized, authorised [Brit]

See also: influential, official, standard

Encyclopedia: Authoritative