Definition of "authoritative"

authoritative

/ɔːˈθɒɹɪˌteɪtɪv/

adjective
comparative more authoritative, superlative most authoritative
1. Arising or originating from a figure of authority
2. Highly accurate or definitive; treated or worthy of treatment as a scholarly authority
3. Having a commanding style.
  Quotations
  The fourth model is called the enlightment model: Actors are seen to be responsible for problems but unable or unwilling to provide solutions. They are believed to need discipline provided by authoritative guidance. The Alcoholic Anonymous[sic] groups are considered prototypical for this model.
  2013 June 29, Leo Montada, “Coping with Life Stress”, in Herman Steensma, Riël Vermunt, editors, Social Justice in Human Relations Volume 2: Societal and Psychological Consequences of Justice and Injustice‎, Springer Science & Business Media, page 26