1
a
: the overhead inside lining of a room
The room has a high ceiling.
b
: material used to ceil a wall or roof of a room
2
: something thought of as an overhanging shelter or a lofty canopy
a ceiling of stars
3
a
: the height above the ground from which prominent objects on the ground can be seen and identified
b
: the height above the ground of the base of the lowest layer of clouds when over half of the sky is obscured
4
a
b
5
: an upper usually prescribed limit
a ceiling on prices, rents, and wages
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Merriam-Webster unabridged
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