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authoritative

[uh-thawr-i-tey-tiv, uh-thor-]
adjective
  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.
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Origin of authoritative

First recorded in 1595–1605; authorit(y) + -ative
Related formsau·thor·i·ta·tive·ly, adverbau·thor·i·ta·tive·ness, nounnon·au·thor·i·ta·tive, adjectivenon·au·thor·i·ta·tive·ly, adverbnon·au·thor·i·ta·tive·ness, nounun·au·thor·i·ta·tive, adjectiveun·au·thor·i·ta·tive·ly, adverbun·au·thor·i·ta·tive·ness, noun

Synonyms for authoritative

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for non-authoritative

authoritative

adjective
  1. recognized or accepted as being true or reliablean authoritative article on drugs
  2. exercising or asserting authority; commandingan authoritative manner
  3. possessing or supported by authority; officialan authoritative communiqué
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Derived Formsauthoritatively, adverbauthoritativeness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for non-authoritative

authoritative

adj.

c.1600, "dictatorial" (a sense now restricted to authoritarian), from Medieval Latin authoritativus (see authority). Meaning "possessing authority" is recorded from 1650s; that of "proceeding from proper authority" is from 1809. Related: Authoritatively; authoritativeness.

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Online Etymology Dictionary, © 2010 Douglas Harper