alien Pronunciation: /ˈeɪlɪən/Translate alien | into French | into Italian | into Spanish German translation of alienA. adj. 1 (strange) fremd 2 (foreign) ausländischB. n. 1 (from another world) Außerirdische 2 [Admin.] (foreigner) Ausländer, Ausländerinalien in other Oxford dictionaries Definition of alien in the British & World English dictionary Definition of alien in the US English dictionary