Vault  —n. 1 arched roof. 2 vaultlike covering (vault of heaven). 3 underground storage chamber or place of interment beneath a church or in a cemetery etc. 4 act of vaulting. —v. 1 leap, esp. Using the hands or a pole. 2 spring over in this way. 3 (esp. As vaulted) a make in the form of a vault. B provide with a vault or vaults. [latin volvo roll]