ceiling -- (the overhead upper surface of a covered space; "he hated painting the ceiling")
ceiling -- ((meteorology) altitude of the lowest layer of clouds)
ceiling, roof, cap -- (an upper limit on what is allowed; "he put a ceiling on the number of women who worked for him"; "there was a roof on salaries"; "they established a cap for prices")
ceiling -- (maximum altitude at which a plane can fly (under specified conditions))