An arched structure, usually of masonry or concrete, serving to cover a space. An arched overhead covering, such as the sky, that resembles the architectural structure in form. A room or space, such as a cellar or storeroom, with arched walls and ceiling, especially when underground. A room or compartment, often built of steel, for the safekeeping of valuables: a bank vault. A burial chamber, especially when underground. Anatomy An arched part of the body, especially the top part of the skull. To construct or supply with an arched ceiling; cover with a vault. To build or make in the shape of a vault; arch. To jump or leap over, especially with the aid of a support such as the hands or a pole. To jump or leap, especially with the use of the hands or a pole. To accomplish something as if by leaping suddenly or vigorously: vaulted into a position of wealth. The act of vaulting; a jump.