airspace

from WordNet (r) 3.0 (2006)

airspace
    n 1: the space in the atmosphere immediately above the earth
         [syn: {airspace}, {air space}]
    2: the atmosphere above a nation that is deemed to be under its
       jurisdiction; "the plane was refused permission to enter
       Chinese airspace"

from The Collaborative International Dictionary of English v.0.48

airspace \air"space`\ n.
   1. the atmosphere above a nation and deemed to be under its
      jurisdiction.
      [WordNet 1.5]