Definition of superstate noun from the Oxford Advanced Learner's Dictionary

 

superstate

 noun
noun
BrE BrE//ˈsuːpəsteɪt//
 
, BrE//ˈsjuːpəsteɪt//
 
; NAmE NAmE//ˈsuːpərsteɪt//
 
 
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a very powerful state, especially one that is formed by several nations joining or working together the European superstate
See the Oxford Advanced American Dictionary entry: superstate