Definitions from Wiktionary (airspace)

▸ noun:  (politics, aviation) A specified portion of the atmosphere, especially that under the technical aviation control and/or jurisdiction of a particular state over which territory (and territorial waters) it lies.
▸ noun:  (aviation) that part of the sky designated for the sole use of aircraft.
▸ noun:  (broadcasting) Space (i.e. a few neighboring frequencies) available for broadcasting within a particular frequency band.
▸ noun:  The portion of an enclosed area which contains air, especially breathable air.
▸ noun:  (construction) The cavity in a cavity wall containing air for insulation.
▸ Also see airspace

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