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English definition of “vault”

vault

noun [C] (ROOM)   /vɔlt/
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 noun (ROOM) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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