- having due authority; having the sanction or weight of authority: an authoritative opinion.
- substantiated or supported by documentary evidence and accepted by most authorities in a field: an authoritative edition of Shakespeare; an authoritative treatment of a subject.
- having an air of authority; accustomed to exercising authority; positive; peremptory; dictatorial: said with an authoritative air.
- recognized or accepted as being true or reliable
- exercising or asserting authority; commanding
- possessing or supported by authority; official
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