Wall (noun)

1. An upright structure serving as an enclosing boundary of a building, room, or other space.
2. A defensive structure designed to prevent enemy intrusion.
3. An architectural partition with a height and length greater than its thickness, used to divide or enclose an area or to support another structure.
4. A wall-like formation or mass.
5. A steep rock face or cliff.

Origin:

Middle english, from old english weall; akin to old high german wall wall, old norse veggr.

Examples:

1. She painted the walls of the living room a light blue.
2. The Great Wall of China is a defensive wall built to protect the country from invaders.
3. The wall separated the kitchen from the dining room.
4. The waterfall flowed down the wall of the canyon.
5. The climbers scaled the wall of the mountain.