noun. The portion of the atmosphere directly above the land or water, used by aircraft or by earth-based structures such as skyscrapers.

noun. The airspace of a particular jurisdiction, such as a nation.

noun. In ornithology, an air-cell of large size; an air-receptacle or a pneumatocyst (which see).

noun. In medicine and sanitary science, the clear cubic contents of a room, as the ward of a hospital, with reference to the respirable air contained in it: as, air-space per man, so many cubic feet.

noun. In firearms, a vacant space between the powder-charge and the projectile.

noun. the atmosphere above a nation and deemed to be under its jurisdiction.

noun. 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. A designated part of the sky for aircraft use.

noun. 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. The cavity in a cavity wall containing air for insulation.

noun. the space in the atmosphere immediately above the earth

noun. the atmosphere above a nation that is deemed to be under its jurisdiction

noun. the space in the atmosphere immediately above the earth

"On an average day within Canada and the United States, there are about 200,000 domestic flights, with another 1,500 flights inbound from overseas areas, so you can appreciate that surveillance of our airspace is an enormous task."

dead-air space  

air  atmosphere  space  

airfield  airlift  brigade  centralize  coördination