noun
definition
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.
example
Various European countries transferred the aviation control of their adjoining airspace to Eurocontrol, while each retaining legal jurisdiction.
definition
That part of the sky designated for the sole use of aircraft.
definition
Space (i.e. a few neighboring frequencies) available for broadcasting within a particular frequency band.
example
The legalisation of free radios caused a bitter fight for airspace.
definition
The portion of an enclosed area which contains air, especially breathable air.
definition
The cavity in a cavity wall containing air for insulation.