Definition of wall:
an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure; "the south wall had a small window"; "the walls were covered with pictures"
anything that suggests a wall in structure or function or effect; "a wall of water"; "a wall of smoke"; "a wall of prejudice"; "negotiations ran into a brick wall"
(anatomy) a layer (a lining or membrane) that encloses a structure; "stomach walls"
a difficult or awkward situation; "his back was to the wall"; "competition was pushing them to the wall"
a vertical (or almost vertical) smooth rock face (as of a cave or mountain)
a layer of material that encloses space; "the walls of the cylinder were perforated"; "the container's walls were blue"
a masonry fence (as around an estate or garden); "the wall followed the road"; "he ducked behind the garden wall and waited"
an embankment built around a space for defensive purposes; "they stormed the ramparts of the city"; "they blew the trumpet and the walls came tumbling down"
surround with a wall in order to fortify