The portion of an enclosed area which contains air, especially breathable air.
that part of the sky designated for the sole use of aircraft.
The cavity in a cavity wall containing air for insulation.
Space (i.e. a few neighboring frequencies) available for broadcasting within a particular frequency band.
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.
The bodily process of breathing; the inhalation of air to provide oxygen, and the exhalation of spent air to remove carbon dioxide.
An exchange of views during a discussion.
The mechanical system used to assist breathing.
The replacement of stale or noxious air with fresh.
The public exposure of an issue or topic.
The mechanical system used to circulate and replace air.