airspace
UK: ˈeəspeɪs | US: ˈɛrˌspeɪs
n. the portion of the atmosphere controlled by a country above its territory, including its territorial waters
n. a designated segment of the atmosphere for aviation purposes
n. the physical space occupied by air or gas
The word "airspace" is a compound of "air" (from Old French air, Latin aer, Greek aēr, meaning "atmosphere") and "space" (from Old French espace, Latin spatium, meaning "extent or area"). It emerged in the early 20th century with the rise of aviation, reflecting the need to define controlled portions of the sky. The logical combination of "air" and "space" directly conveys its modern meaning of a regulated atmospheric zone.
The aircraft entered restricted airspace without permission.
Commercial flights must adhere to designated airspace corridors.
The country expanded its airspace to include offshore zones.
Air traffic controllers monitor airspace to prevent collisions.
Drones are prohibited in military airspace for security reasons.