(aviation) The highest altitude at which an aircraft can safely maintain flight.
(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."
(mathematics) The smallest integer greater than or equal to a given number.
“It took on a vaguely human outline and grew until it filled the room ceiling to floor.”
“The doctors began an indefinite strike against CPS's plans to impose a ceiling on the yearly level of reimbursed care.”
“Having attained the ceiling of debt to equity beyond which it cannot borrow further funds, the company has no choice but to compete less aggressively.”
ceiler
One who ceils, who lines or finishes a surface in construction.