Meaning of “authoritative” in the English Dictionary

"authoritative" in British English

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authoritativeadjective

uk /ɔːˈθɒr.ɪ.tə.tɪv/ us /əˈθɔːr.ə.t̬ə.t̬ɪv/
authoritatively
adverb uk /ɔːˈθɒr.ɪ.tə.tɪv.li/ us /əˈθɔːr.ə.t̬ə.t̬ɪv.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 special knowledge, or (of a person) showing the confidence of having special knowledge:

an authoritative manner
Her opinion on the subject was considered authoritative.
authoritatively
adverb us /əˈθɔr·əˌteɪt̬·ɪv·li, əˈθɑr-/

He spoke authoritatively about police work.

(Definition of “authoritative” from the Cambridge Academic Content Dictionary © Cambridge University Press)