airlinePronunciation: /ˈɛːlʌɪn/Translate airline | into French | into German | into Italian | into Spanish Definition of airline noun 1an organization providing a regular public service of air transport on one or more routes: [as modifier]:airline pilot 2 (usually air line) a pipe supplying air: use an air line to inflate those tyresairline in other Oxford dictionaries Definition of airline in the US English dictionary