Meaning

• To line or finish (a surface, such as a wall), with plaster, stucco, thin boards, or similar.

• To set a higher bound.

Meaning

• The overhead closure of a room.

  "the dining room had an ornate ceiling"

• The upper limit of an object or action.

• The highest altitude at which an aircraft can safely maintain flight.

• 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."

• 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"

• The inner planking of a vessel.