n. In Italian arch.n. A gallery or areade in a building, properly at the height of one or more stories, running along the front or part of the front of the building, and open on at least one side to the air, on which side is a series of pillars or slender piers.n. A large ornamental window in the middle of the chief story of a building, often projecting from the wall, as seen in old Venetian palaces.