Definition of insider
: a person recognized or accepted as a member of a group, category, or organization: such as
a
: a person who is in a position of power or has access to confidential information
b
: a person (such as an officer or director) who is in a position to have special knowledge of the affairs of or to influence the decisions of a company
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Merriam-Webster unabridged
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Time Traveler for insider
The first known use of insider was in 1848
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