superpower Syllabification: (su·per·pow·er)Pronunciation: /ˈso͞opərˌpouər/Translate superpower | into French | into German | into Italian | into Spanish Definition of superpower noun a very powerful and influential nation (used especially with reference to the US and the former Soviet Union when these were perceived as the two most powerful nations in the world). superpower in other Oxford dictionaries Definition of superpower in the British & World English dictionary