a person who is a member of a group, organization, society, etc.
a person belonging to a limited circle of persons who understand the actual facts in a situation or share private knowledge: Insiders knew that the president would veto the bill.
a person who has some special advantage or influence.
a person in possession of corporate information not generally available to the public, as a director, an accountant, or other officer or employee of a corporation.

1820–30; inside + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
insider (ˌɪnˈsaɪdə)
1.  a member of a specified group
2.  a person with access to exclusive information

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Visitors are given an insider's tour of the facility's launch sites, rockets
  and spaceflight simulators.
Come for this walk-through and gallery talk to get an insider's perspective on
  the work.
It is the elite view of a mental health insider constantly reading the
  literature and discussing the condition with colleagues.
The temptation to gain lucrative insider knowledge of corporate planning and
  intellectual property is a large one.
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