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.
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
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