'insider' definitions:

Definition of 'insider'

(from WordNet)
noun
An officer of a corporation or others who have access to private information about the corporation's operations

Definition of 'insider'

From: GCIDE
  • insider \insider\ n. an officer of a corporation or others who have access to private information about the corporation's operations, especially information relating to profitability.
  • Note: An insider is forbidden by U. S. securities laws to trade stock in publicly owned corporations based on the private information. The definition of insider for the purpose of securities law has changed in the late 29th century to become more inclusive, whereas it initially was applied only to officers of a corporation. [WordNet 1.5 +PJC]

Synonyms of 'insider'

From: Moby Thesaurus