n. A hastily made fortification of trees, earth, paving-stones, palisades, wagons, or anything that can obstruct the progress of an enemy or serve for defense or security.n. A temporary barrier of any kind designed to obstruct passage into or through a space intended to be kept free for a particular use.n. Any bar or obstruction; that which defends.n. In naval architecture, a strong wooden rail, supported by stanchions, extending across the foremost part of the quarter-deck, in ships of war, and backed with ropes, mats, pieces of old cable, and full hammocks, as a protection against small shot in time of action.To obstruct or block (a path or passage) with a barricade.To block or render impassable.To shut in and defend with a barricade; hem in.Also formerly barricado.