airclearance
nounUK /ˈeəklɪərəns/
US /ˈerklɪrəns/
Airclearance is the space above something so it can move or fit without bumping.
The tall truck needed extra airclearance to pass under the bridge.
OTHER MEANINGS
2. Official permission for an aircraft to fly or land.
The pilot waited for airclearance before taking off.
3. The removal of stale or polluted air from a space.
The workshop installed fans for better airclearance.
4. The distance between a vehicle's top and an obstacle above it.
Check the airclearance before driving the van into the garage.