Leaving or exiting a facility such as a library or museum (the act of exiting).
閉館時間になりましたので、皆様は退館してください。
It is closing time, so everyone please leave the building.
展示室を見終わったら順路に沿って退館してください。
After finishing viewing the exhibits, please exit following the route.
入館と退館の記録を出入口でスタッフが確認した。
Staff at the entrance/exit checked the records of entry and exit.