autobahnPronunciation: /ˈɔːtə(ʊ)bɑːn, ˈaʊtobaːn/Definition of autobahn noun a German, Austrian, or Swiss motorway. Origin: 1930s: from German, from Auto 'motor car' + Bahn 'path, road'autobahn in other Oxford dictionaries Definition of autobahn in the US English dictionary