authoritative - Dictionary definition and pronunciation - Yahoo! Education
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Definition of authoritative

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au·thor·i·ta·tive  audio  (-thôr-ttv, -thr-, ô-thôr-, ô-thr-) KEY 

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


OTHER FORMS:
au·thori·tative·ly(Adverb), au·thori·tative·ness(Noun)


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