An opening, possibly covered by a grate or grill, possibly ducted, that allows air to circulate. / A device or valve that allows to air to be evacuated from a radiator or pipe in a heating system.

The act of delivering goods, equipment, or personnel by dropping them from an aircraft in flight. / (cryptocurrencies) The distribution of free tokens to help bootstrap a new cryptocurrency.

To delivery goods, equipment, or personnel by dropping them from an aircraft in flight.

The erratic movement of air masses in the absence of any visual cues, especially such movement that causes unexpected turbulence to an aircraft.

The transportation of freight by air. / The amount charged for such transport.

(transitive) To transport by air.

A unit of distance for air transport; equal to a nautical mile.

A brake (slowing device) that is operated pneumatically (by air pressure).

(board sports, idiomatic) To make a jump.

(idiomatic) (Extreme sports) Superlative of catch air; make a big jump high off the ground