noun
outside an organization; external
Used to indicate something or someone is not part of a particular group, department, or organization. Often appears in compounds like 部外者 (outsider) or 部外秘 (confidential).
部外者の立ち入りは禁止されています。
Entry by outsiders is prohibited.
この資料は部外秘です。
This document is confidential (not to be disclosed to outsiders).