authoritative Meaning in the Cambridge English Dictionary
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Meaning of “authoritative” in the English Dictionary

"authoritative" in British English

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authoritativeadjective

uk   /ɔːˈθɒr.ɪ.tə.tɪv/  us   /əˈθɔːr.ɪ.t̬ə.t̬ɪv/
showing that you are ​confident, in ​control, and ​expect to be ​respected and ​obeyed: She has an authoritative manner that at ​times is ​almostarrogant. containingcomplete and ​accurateinformation, and ​thereforerespected: The ​book is an authoritative account of the Second World War.
authoritatively
adverb uk   us   /-li/
(Definition of authoritative from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"authoritative" in American English

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authoritativeadjective

 us   /əˈθɔr·əˌteɪ·t̬ɪv, əˈθɑr-/
having the ​power of ​specialknowledge, or (of a ​person) ​showing the ​confidence of having ​specialknowledge: an authoritative ​manner Her ​opinion on the ​subject was ​considered authoritative.
authoritatively
adverb  us   /əˈθɔr·əˌteɪt̬·ɪv·li, əˈθɑr-/
He ​spoke authoritatively about ​policework.
(Definition of authoritative from the Cambridge Academic Content Dictionary © Cambridge University Press)
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