noun ·2 syllables ·Moderate ·College level

Definitions

Noun

1. 1
   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. countable, uncountable

   "Holonym: aerospace (not synonymous)"

2. 2
   the atmosphere above a nation that is deemed to be under its jurisdiction wordnet
3. 3
   that part of the sky designated for the sole use of aircraft. countable, uncountable
4. 4
   the space in the atmosphere immediately above the earth wordnet
5. 5
   Space (i.e. a few neighboring frequencies) available for broadcasting within a particular frequency band. countable, uncountable

   "The legalisation of free radios caused a bitter fight for airspace."

Show 2 more definitions

6. 6
   The portion of an enclosed area which contains air, especially breathable air. countable, uncountable
7. 7
   The cavity in a cavity wall containing air for insulation. countable, uncountable

Synonyms

All synonyms

aerospaceaerosphereairair holeair pocketair space

Example

More examples

"A commercial airplane allegedly violated military airspace."

Etymology

From air + space.

Related phrases

cavity wall

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.