Meanings

to pretend not to know

to fly through the air

empty residence

man-portable air-defense system

superficial velocity

aerospace

airplane mode (setting on an electronic device)

aerospace engineering

geospatial

burglary (carried out while a house is temporarily vacated)

feeling of emptiness

elevated railway

Banach space

linear space

covering space

de Sitter space

anti-de Sitter space

canoe, etc. in very clear water (illusion of flying)

air cannon (toy)

aeronautical chart