"ceilings" in the noun sense
the overhead upper surface of a covered space
"he hated painting the ceiling"
meteorology) altitude of the lowest layer of clouds
3. 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"
maximum altitude at which a plane can fly (under specified conditions)
Source: WordNet® (An amazing lexical database of English)
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