[ in-sahy-der ]
/ ˌɪnˈsaɪ dər /


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.

Origin of insider

First recorded in 1820–30; inside + -er1 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for insider

British Dictionary definitions for insider


/ (ˌɪnˈsaɪdə) /


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

Word Origin and History for insider



"one in possession of special information by virtue of being within some organization," 1848, from inside + -er (1). Originally in reference to the stock markets.

Online Etymology Dictionary, © 2010 Douglas Harper