au·thor·i·ta·tive /ɔːˈθɒrətətɪv, ə- $ ɒːˈθɑːrəteɪtɪv, əˈθɔː-/ ●○○ AWL adjectiveadj 1 BELIEVEan authoritative book, account etc is respected because the person who wrote it knows a lot about the subject 权威性的,可信的,可靠的 the most authoritative work on English surnames 有关英语姓氏的最权威著作
2 CONFIDENTbehaving or speaking in a confident determined way that makes people respect and obey you 权威的,有威信的,威严的 He has a commanding presence and an authoritative voice. 他仪态庄重,声音威严。
—authoritatively adverbadv