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English definition of “authoritative”

authoritative

adjective 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 almost arrogant. containing complete and accurate information, and therefore respected: The book is an authoritative account of the Second World War.
authoritatively
adverb uk   /-li/ us  
(Definition of authoritative from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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