insider

[ in-sahy-der ]
/ ˌɪnˈsaɪ dər /

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.

Origin of insider

First recorded in 1820–30; inside + -er1

Example sentences from the Web for insider

British Dictionary definitions for insider

insider
/ (ˌɪnˈsaɪdə) /

noun

a member of a specified group
a person with access to exclusive information