What does WALL mean?

noun

1. 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”
2. anything that suggests a wall in structure or function or effect“a wall of water”
3. (anatomy) a layer (a lining or membrane) that encloses a structure“stomach walls”
4. a difficult or awkward situation“his back was to the wall”
5. a vertical (or almost vertical) smooth rock face (as of a cave or mountain)
6. a layer of material that encloses space“the walls of the cylinder were perforated”
7. a masonry fence (as around an estate or garden)“the wall followed the road”
8. an embankment built around a space for defensive purposes“they stormed the ramparts of the city”