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authoritative

[uh-thawr-i-tey-tiv, uh-thor-] /əˈθɔr ɪˌteɪ tɪv, əˈθɒr-/
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.
Origin
1595-1605
1595-1605; authorit(y) + -ative
Related forms
authoritatively, adverb
authoritativeness, noun
nonauthoritative, adjective
nonauthoritatively, adverb
nonauthoritativeness, noun
unauthoritative, adjective
unauthoritatively, adverb
unauthoritativeness, noun
Synonyms
1. official. 3. dogmatic, authoritarian.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un authoritative

authoritative

/ɔːˈθɒrɪtətɪv/
adjective
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
Derived Forms
authoritatively, adverb
authoritativeness, 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
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Word Origin and History for un 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.

Online Etymology Dictionary, © 2010 Douglas Harper
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