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.
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.
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.
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
Word Usage
"In Sunday's now-famous "60 Minutes" report, based on a book by the Hoover Institution's Peter Schweizer, the term "insider information" is used even more loosely."