Meaning of “wall” - Learner’s Dictionary

wall

noun [ C ] us uk /wɔːl/
PART OF BUILDING

A1 one of the vertical sides of a room or building:

There were several large paintings on the wall.

More examples

DIVIDE AREA

A1 a vertical structure made of brick or stone that divides areas that are owned by different people:

a garden wall

(Definition of “wall” from the Cambridge Learner’s Dictionary © Cambridge University Press)