authoritativeKK [əˋθɔrəˏtetɪv] /əˈθɔɹəˌteɪtɪv/形容詞1權威的、可靠的This book is still the most authoritative study of the subject.這本書至今仍是該主題最具權威的研究。2威嚴的、有威信的She spoke in a calm, authoritative voice and everyone listened.她以冷靜而威嚴的聲音說話,所有人都聽了進去。3官方的、正式的We are waiting for an authoritative ruling from the committee.我們正在等委員會的正式裁決。