1) Air space 2) Flight zone 3) Flying zone 4) No-fly zone 5) Room at the top 6) Room for certain traffic 7) Space 8) Zone that may be restricted 
Airspace means the portion of the atmosphere controlled by a country above its territory, including its territorial waters or, more generally, any specific three-dimensional portion of the atmosphere. It is not the same as aerospace, which is the general term for Earth`s atmosphere and the outer space in its vicinity. Airspace may be further subd....
A three-dimensional area described in terms of altitude as well as by other characteristics such as whether it is above an urban or remote area. Airspace is broken into the two broad groups – controlled and uncontrolled airspace – then into Class A - Class G. Class A - Class E designate ...
Pertaining to the portion of the lung distal to the conducting airways or bronchi; alveolar. ... (05 Mar 2000) ... 
Type: Term Pronunciation: ār′spās Definitions: 1. Pertaining to the portion of the lung distal to the conducting airways or bronchi; alveolar.
Airspace is the space that lies above a state's land and sea territory and is subject to its exclusive jurisdiction.
[n] - the atmosphere above a nation and deemed to be under its jurisdiction
noun the atmosphere above a nation that is deemed to be under its jurisdiction; `the plane was refused permission to enter Chinese airspace`