<p><strong>noun</strong></p><ul><li>any of various permanent upright constructions having a length much greater than the thickness and presenting a continuous surface except where pierced by doors, windows, etc.: used for shelter, protection, or privacy, or to subdivide interior space, to support floors, roofs, or the like, to retain earth, to fence in an area, etc.</li><li>Usually walls.</li><li>a rampart raised for defensive purposes.</li><li>anything serving as a bulwark or defense.</li><li>an immaterial or intangible barrier, obstruction, etc., suggesting a wall: a wall of prejudice.</li><li>a wall-like, enclosing part, thing, mass, etc.: a wall of fire; a wall of troops.</li><li>an embankment to prevent flooding, as a levee or sea wall.</li><li>the outermost film or layer of structural material protecting, surrounding, and defining the physical limits of an object: the wall of a blood cell.</li><li>Soccer. a line of defenders standing shoulder to shoulder in an attempt to block a free kick with their bodies.</li><li>Mining. the side of a level or drift; the overhanging or underlying side of a vein; a hanging wall or footwall.</li></ul><p><strong>adjective</strong></p><ul><li>of or relating to a wall: wall space.</li><li>growing against or on a wall: wall plants; wall cress.</li><li>situated, placed, or installed in or on a wall: wall oven; a wall safe.</li></ul><p><strong>verb</strong></p><ul><li>(used with object) to enclose, shut off, divide, protect, border, etc., with or as if with a wall (often followed by in or off): to wall the yard; to wall in the play area; He is walled in by lack of opportunity.</li><li>to seal or fill (a doorway or other opening) with a wall: to wall an unused entrance.</li><li>to seal or entomb (something or someone) within a wall (usually followed by up): The workmen had walled up the cat quite by mistake.</li></ul><p><strong>Synonyms:</strong></p><ul><li>immure</li></ul>