1.Definition: a commercial enterprise that provides scheduled flights for passengers

Related Noun(s):airline

Category: Objects

2.Definition: a designated route followed by airplanes in flying from one airport to another

Related Noun(s):air lane, flight path, skyway

Category: Places

3.Definition: a duct that provides ventilation (as in mines)

Category: Objects

4.Definition: the passages through which air enters and leaves the body

Category: General