CAVOK

Noun

ceiling (plural ceilings)

1. The overhead closure of a room.
   • The dining room had an ornate ceiling.
2. The upper limit of an object or action.
   • […] and only at Barnet did Tappin give Empire of India a burst to bring us up to the 60 m.p.h. speed ceiling of the London area.1956 December, W. J. Alcock, “On the Footplate of the "Elizabethan"”, in Railway Magazine, page 821

   Synonyms:

   cap

   Antonyms:

   floor

3. The highest altitude at which an aircraft can safely maintain flight.
4. 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.
5. 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.
6. The inner planking of a vessel.

See all 8 meanings of ceiling