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Definition of authoritative adjective from the Oxford Advanced American Dictionary

Academic

authoritative

adjective
/əˈθɔrəˌteɪt̮ɪv; əˈθɑr‑/ authoritative pronunciation American
 
1 that you can trust and respect as true and correctthe most authoritative book on the subject2 showing that you expect people to obey and respect youan authoritative tone of voice authoritatively adverb