Ceiling (aeronautics)
WordNet
noun
(1) The overhead upper surface of a room
"He hated painting the ceiling"
(2) (meteorology) altitude of the lowest layer of clouds
(3) Maximum altitude at which a plane can fly (under specified conditions)
(4) An upper limit on what is allowed
"They established a cap for prices"
WiktionaryText
Noun
- The highest altitude at which an aircraft may fly due to physical factors, such as low air density.