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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. adj. Having or arising from authority; official: an authoritative decree; authoritative sources.
  2. adj. Of acknowledged accuracy or excellence; highly reliable: an authoritative account of the revolution.
  3. adj. Wielding authority; commanding: the captain's authoritative manner.

Century Dictionary and Cyclopedia

  1. Having due authority; having the sanction or weight of authority; entitled to credence or obedience: as, “authoritative teaching,” Barrow.
  2. Having an air of authority; positive; peremptory; dictatorial.
  3. Synonyms Authoritative, Magisterial, etc. (see magisterial), commanding.

Wiktionary

  1. adj. Arising or originating from a figure of authority
  2. adj. Highly accurate or definitive; treated or worthy of treatment as a scholarly authority
  3. adj. Having a commanding style.

GNU Webster's 1913

  1. adj. Having, or proceeding from, due authority; entitled to obedience, credit, or acceptance; determinate; commanding.
  2. adj. Having an air of authority; positive; dictatorial; peremptory.

WordNet 3.0

  1. adj. having authority or ascendancy or influence
  2. adj. of recognized authority or excellence
  3. adj. sanctioned by established authority

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‘authoritative’ has been looked up 2199 times, added to 9 lists, and has a Scrabble score of 19.