ceiling

The definition of ceiling means the topmost part of the inside of a room, or the upper limit.

(noun)

See ceiling in Webster's New World College Dictionary

noun

the inside top part or covering of a room, opposite the floor
any overhanging expanse seen from below
an upper limit set on anything, as by official regulation: a ceiling on prices
Aeron.
1. a covering of clouds limiting vertical visibility
2. the height of the lower surface of such a covering
3. the maximum height at which an aircraft can fly under normal conditions

Origin: < ceil

See ceiling in American Heritage Dictionary 4

noun

a. The upper interior surface of a room.
b. Material used to cover this surface.
Something resembling a ceiling: a ceiling of leaves over the arbor.
An upper limit, especially as set by regulation: wage and price ceilings.
a. The highest altitude under particular weather conditions from which the ground is still visible.
b. The altitude of the lowest layer of clouds.
c. Absolute ceiling.
Nautical The planking applied to the interior framework of a ship.