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[uh-thawr-i-tey-tiv, uh-thor-] /əˈθɔr ɪˌteɪ tɪv, əˈθɒr-/

having due ; having the sanction or weight of :
an authoritative opinion.
substantiated or supported by documentary evidence and accepted by most in a field:
an authoritative edition of Shakespeare; an authoritative treatment of a subject.
having an air of ; accustomed to exercising ; positive; peremptory; dictatorial:
said with an authoritative air.
recognized or accepted as being true or reliable: an authoritative article on drugs
exercising or asserting authority; commanding: an authoritative manner
possessing or supported by authority; official: an authoritative communiqué

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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