Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An accepted member of a group.
  • n. One who has special knowledge or access to confidential information.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A person who has special knowledge about the inner workings of a group, organization, or institution.
  • n. A person who is within an enclosed space.

from the GNU version of the Collaborative International Dictionary of English

  • n. an officer of a corporation or others who have access to private information about the corporation's operations, especially information relating to profitability.

from The Century Dictionary and Cyclopedia

  • n. One who is inside; one who is within the limits of some place, structure, society, organization (as a church), etc.
  • n. Hence One who has some special advantage, as in a business enterprise.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an officer of a corporation or others who have access to private information about the corporation's operations

Etymologies

inside +‎ -er (Wiktionary)

Examples

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