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insider

[ in-sahy-der ]
/ ˌɪnˈsaɪ dər /
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See synonyms for: insider / insiders on Thesaurus.com

noun
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.
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Origin of insider

First recorded in 1820–30; inside + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use insider in a sentence

British Dictionary definitions for insider

insider
/ (ˌɪnˈsaɪdə) /

noun
a member of a specified group
a person with access to exclusive information
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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