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Learner's definition of AUTHORITY  
[noncount]  : the power to give orders or make decisions : the power or right to direct or control someone or something
Synonyms see: 1power
: the confident quality of someone who knows a lot about something or who is respected or obeyed by other people
   b  : a quality that makes something seem true or real
authorities [plural]  : people who have power to make decisions and enforce rules and laws — often used with the
[count]  : a person who is an expert on a subject — usually + on
[count]  : a government organization that has control of a specified activity or area

have it on good/excellent authority

◊ If you have it on good/excellent authority that something is true, you have been told that it is true by someone you trust and believe.
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