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authority

noun [C] (EXPERT)
 
 
/ɔːˈθɒr.ɪ.ti/ US  /əˈθɔːr.ɪ.t̬i/

Definition

C2 an expert on a subject: She's a world authority on 19th-century Irish history.Experts and specialists
(Definition of authority noun (EXPERT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of authority