From Longman Dictionary of Contemporary Englishinsiderin‧sid‧er /ɪnˈsaɪdə $ -ər/ noun [countable] SSOMEMBERsomeone who has a special knowledge of a particular organization because they are part of it OPP outsider an insider’s view of the way that a Japanese company works
Examples from the Corpus
insider• Insiders have been predicting that the company would be involved in a takeover bid for some time.• Does a director, as an insider, owe fiduciary duties to his shareholders?• But insiders say the clean-up is really aimed at booting scores of barely pubescent, panhandling road-warrior wannabes from the Avenue.• For insider dealing does not lack victims but rather, credible plaintiffs.• a White House insider• Several people went to prison after the investigation into insider trading.• People in Great Groups are never insiders or corporate types on the fast track: They are always on their own track.• There was endless media speculation about who the characters were in real life and which political insider was the author.• Political insiders believe Republicans won't gain control of the Senate.• She is the insider with the sharp eye of an outsider.• She uses perfectly legal ways to gather public information about the homes that many Washington insiders like to keep secret.• The Labour party was geared for a May 3 general election, and for weeks insiders insisted there would be no change.From Longman Business Dictionaryinsiderin‧sid‧er /ɪnˈsaɪdə-ər/ noun [countable] someone who works for a company or an organization and so has information about it that is not available to other peopleCompany insiders have expressed their reservations about the deal.Some industry insiders are very critical of the government. 