vault

/vɔlt/ n [C] (ROOM)

Definition

› a room, esp. in or under the ground floor of a large building, that is used to store things safely: The museum keeps many of its treasures in temperature-controlled storage vaults. › In a bank, a vault is where money, jewelry, important documents, etc., are locked for protection.

(Definition of vault n (ROOM) from the Cambridge Academic Content Dictionary © Cambridge University Press)