Definition of insider noun from the Oxford Advanced Learner's Dictionary

 

insider

 noun
noun
BrE BrE//ɪnˈsaɪdə(r)//
 
; NAmE NAmE//ɪnˈsaɪdər//
 
 
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a person who knows a lot about a group or an organization, because they are part of it The situation was described by one insider as ‘absolute chaos’. compare outsider an insider’s view of the movie industry a Wall Street dealer convicted of insider trading
See the Oxford Advanced American Dictionary entry: insider

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