What is Ceiling ?
Ceiling is (noun) 1. an inside roof over a room He’s so tall, he can easily touch the ceiling. Flies can walk on the ceiling. He painted the kitchen ceiling. Watch out when you go into the bedroom – it has a very low ceiling. 2. the highest point that something or someone reaches or is allowed to reach Output has reached its ceiling. There is a ceiling of £20,000 on the amount you can hold in premium bonds. They set a ceiling of £1000 on the price of their washing machines.
source: Easier English, Student Dictionary Upper Intermediate Level