[uh-thawr-i-tey-tiv, uh-thor-]
having due authority; having the sanction or weight of authority: an authoritative opinion.
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.
having an air of authority; accustomed to exercising authority; positive; peremptory; dictatorial: said with an authoritative air.

1595–1605; authorit(y) + -ative

authoritatively, adverb
authoritativeness, noun
nonauthoritative, adjective
nonauthoritatively, adverb
nonauthoritativeness, noun
unauthoritative, adjective
unauthoritatively, adverb
unauthoritativeness, noun

1. official. 3. dogmatic, authoritarian. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
authoritative (ɔːˈθɒrɪtətɪv)
1.  recognized or accepted as being true or reliable: an authoritative article on drugs
2.  exercising or asserting authority; commanding: an authoritative manner
3.  possessing or supported by authority; official: an authoritative communiqué

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1600, "dictatorial" (a sense now restricted to authoritarian), from authority (q.v.). Meaning "possessing authority" is recorded from 1650s; that of "proceeding from proper authority" is from 1809.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He could talk for hours about a number of topics, and do so authoritatively,
  all the while holding the attention of his students.
At that time scientists no less authoritatively defended their perspectives to
  laymen than they do today.
He is not qualified to comment authoritatively on human caused global warming.
It gets around well enough, but it doesn't move out authoritatively.
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