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• the overhead upper surface of a covered space

  holo part	hallhallwayroom
  hypernym	upper surface
  hyponym	overhead

• (meteorology) altitude of the lowest layer of clouds

  domain topic	meteorology
  hypernym	altitudeheight

• maximum altitude at which a plane can fly (under specified conditions)

  hypernym	altitudeheight
  hyponym	absolute ceilingcombat ceilingservice ceiling

• an upper limit on what is allowed

  synonym	caproof
  hypernym	control
  hyponym	glass ceiling