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ceiling

noun

  1. the inside top part or covering of a room, opposite the floor
  2. any overhanging expanse seen from below
  3. an upper limit set on anything, as by official regulation: a ceiling on prices
  4. 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

See ceiling in American Heritage Dictionary 4

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ceiling

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