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authoritative

adjective
 
 
/ɔːˈθɒr.ɪ.tə.tɪv/ US  /əˈθɔːr.ɪ.t̬ə.t̬ɪv/

Definition

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.Controlling and being in charge containing complete and accurate information, and therefore respected: The book is an authoritative account of the Second World War.Accurate and exact authoritatively
 
 
/-li/ adverb
Accurate and exactControlling and being in charge
(Definition of authoritative adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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