Definition of superfast adjective from the Oxford Advanced Learner's Dictionary

 

superfast

 adjective
adjective
BrE BrE//ˈsuːpəfɑːst//
 
, also BrE//ˈsjuːpəfɑːst//
 
; NAmE NAmE//ˈsuːpərfæst//
 
 
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extremely fast a superfast broadband connection They will be introducing new, superfast passenger trains.