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Meaning of authoritative

au•thor•i•ta•tive

Pronunciation: (u-thôr'i-tā"tiv, u-thor'-), [key]
— adj.
  1. having due authority; having the sanction or weight of authority: an authoritative opinion.
  2. substantiated or supported by documentary evidence and accepted by most authorities in a field: an authoritative edition of Shakespeare; an authoritative treatment of a subject.
  3. having an air of authority; accustomed to exercising authority; positive; peremptory; dictatorial: said with an authoritative air.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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