English

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

 

subsonic

 adjective
adjective
BrE BrE//ˌsʌbˈsɒnɪk//
 
; NAmE NAmE//ˌsʌbˈsɑːnɪk//
 
 
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less than the speed of sound; flying at less than the speed of sound compare supersonic
See the Oxford Advanced American Dictionary entry: subsonic