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authority

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authorityˈθorəti/noun
pluralauthorities
authority
ˈθorəti/
noun
pluralauthorities
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
[noncount] 
: 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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