noun The highest altitude at which an aircraft can safely maintain flight.
noun 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."
Even though it was cloudy, there was still enough ceiling for the Blue Angels to perform a great show.
noun The smallest integer greater than or equal to a given number.
The ceiling of 4.5 is 5; the ceiling of −4.5 is −4.
noun The inner planking of a vessel.
noun The maximum permitted level in a financial transaction.
noun The overhead interior surface that covers the upper limits of a room.