authoritative

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ɔːˈθɒrɪtətɪv/

US:USA pronunciation: IPAUSA pronunciation: IPA/əˈθɔrɪˌteɪtɪv, əˈθɑr-/

US:USA pronunciation: respellingUSA pronunciation: respelling(ə thôr′i tā′tiv, ə thor′-)

au•thor•i•ta•tive /əˈθɔrɪˌteɪtɪv, əˈθɑr-/USA pronunciation adj.

having or showing authority;
official:authoritative orders.
supported by evidence and accepted;
able to be trusted: the authoritative account of the story.
having an air or appearance of authority:an authoritative manner.

au•thor•i•ta•tive•ly, adv.
au•thor•i•ta•tive•ness, n. [uncountable]

au•thor•i•ta•tive (ə thôr′i tā′tiv, ə thor′-),USA pronunciation adj.

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.

au•thor′i•ta′tive•ly, adv.
au•thor′i•ta′tive•ness, n.

Collins Concise English Dictionary © HarperCollins Publishers::

authoritative /ɔːˈθɒrɪtətɪv/ adj

auˈthoritatively adv auˈthoritativeness n

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