insider
/ɪnˈsaɪdɚ/
Proposed by a contributor, not yet supported by evidence.
Also seen as: insiders
Sense 1
Meaning · English
A person who has special knowledge about the inner workings of a group, organization, or institution.
Noun
Examples
Near-synonyms: initiate, old hand, habitué
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Sense 2
Meaning · English
A person who is within an enclosed space.
Noun
Examples
To the insider, the ceiling is like a small firmament twinkling with astral radiations.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-08-01 via kaikki.org).
Common questions
What does “insider” mean?
A person who has special knowledge about the inner workings of a group, organization, or institution.
Is “insider” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.