n. 1.an architectural partition with a height and length greater than its thickness 2.an embankment built around a space for defensive purposes 3.anything that suggests a wall in structure or function or effect 4.a masonry fence (as around an estate or garden) 5.(anatomy) a layer (a lining or membrane) that encloses a structure 6.a vertical (or almost vertical) smooth rock face (as of a cave or mountain) 7.a layer of material that encloses space 8.a difficult or awkward situation wall v. 1.surround with a wall in order to fortify