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

 

supersonic

 adjective
adjective
BrE BrE//ˌsuːpəˈsɒnɪk//
 
, BrE//ˌsjuːpəˈsɒnɪk//
 
; NAmE NAmE//ˌsuːpərˈsɑːnɪk//
 
 
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faster than the speed of sound a supersonic aircraft supersonic flight compare subsonic
See the Oxford Advanced American Dictionary entry: supersonic