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authoritative /əˈɵorəˌteɪtɪv/  

  • adjective
    [more ~; most ~]
    having or showing impressive knowledge about a subject
    He is an authoritative [=reliableaccuratesource for information about Islamic art.
    The book is an authoritative guide to the city's restaurants.
    having the confident quality of someone who is respected or obeyed by other people
    His manner is polite but authoritative.
    She addressed the group with an authoritative voice.