insider

Plural: insiders

Noun

• A person who is part of a group or organization.
• an officer of a corporation or others who have access to private information about the corporation's operations
• A person who has special knowledge about the inner workings of a group, organization, or institution.
• A person who is within an enclosed space.

Examples

• As an INSIDER of the Scrabble club, he knew all the unofficial two-letter words.

Antonyms

outsider

Related Words

in-group, ingroup, out-group, outgroup