Insider

//ɪnˈsaɪdɚ// noun

Definitions

Noun
  1. 1
    A person who has special knowledge about the inner workings of a group, organization, or institution.

    "Near-synonyms: initiate, old hand, habitué"

  2. 2
    an officer of a corporation or others who have access to private information about the corporation's operations wordnet
  3. 3
    A person who is within an enclosed space.

    "To the insider, the ceiling is like a small firmament twinkling with astral radiations."

Etymology

From inside + -er.

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