plural of aid

Third-person singular simple present indicative form of aid

A region's air supply. / The region supplied by a source of air.

Alternative form of airshaft

(aviation, of an act or action) With the participants being two or more aircraft in flight. / (aviation, military, of a missile) Fired from an aircraft in flight at another one.

(of a missile) fired from the ground at an aircraft in flight, or at an incoming missile

(of a missile) fired from the ground, or from a ship, at an aircraft in flight, or at an incoming missile

the facility on an airfield or airport where aircraft are loaded and unloaded of passengers or freight

(of a missile) fired from an aircraft at a target on the ground

An emergency service, often operated by a branch of the armed forces that serves to rescue people at sea, or stranded on a coast, normally with the use of helicopters.