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air space

noun
  1. a space occupied by air.
  2. the amount of breathing air in a room or other enclosed space.
  3. the region of the atmosphere above a municipality, state, or nation, over which it has jurisdiction.
  4. the region of the atmosphere above a plot of ground, to which the owner has rights or access.
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Also air·space (for defs 3, 4).

Origin of air space

First recorded in 1900–05
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for airspace

airspace

noun
  1. the atmosphere above the earth or part of the earth, esp the atmosphere above a country deemed to be under its jurisdiction
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012