Definitions from Wiktionary (ceiling)

▸ noun:  The overhead closure of a room.
▸ noun:  The upper limit of an object or action.
▸ noun:  (aviation) The highest altitude at which an aircraft can safely maintain flight.
▸ noun:  (meteorology) The measurement of visible distance from ground or sea level to an overcast cloud cover; under a clear sky, the ceiling measurement is identified as "unlimited."
▸ noun:  (mathematics) The smallest integer greater than or equal to a given number.
▸ noun:  (nautical) The inner planking of a vessel.
▸ noun:  (finance) The maximum permitted level in a financial transaction.
▸ noun:  (architecture) The overhead interior surface that covers the upper limits of a room.

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