airspace

UK: /ˈɛə^rspeɪs/ US: /ˈɛrˌspeɪs/

WordReference Random House Learner's Dictionary of American English © 2026

air•space /ˈɛrˌspeɪs/  n. [uncountable]

1. Government the air or sky above a nation, considered to belong to that nation.

Collins Concise English Dictionary © HarperCollins Publishers::

airspace / ˈɛəˌspeɪs/ noun

1. the atmosphere above the earth or part of the earth, esp the atmosphere above a country deemed to be under its jurisdiction

WordReference Random House Unabridged Dictionary of American English © 2026

air′ space′, 

1. a space occupied by air.
2. the amount of breathing air in a room or other enclosed space.
3. the region of the atmosphere above a municipality, state, or nation, over which it has jurisdiction.
4. the region of the atmosphere above a plot of ground, to which the owner has rights or access.
Also, air′space′ (for defs. 3, 4).
• 1900–05