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

subsonic

adjective
 
/ˌsʌbˈsɒnɪk/
 
/ˌsʌbˈsɑːnɪk/
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  1. less than the speed of sound; flying at less than the speed of sound compare supersonic
See subsonic in the Oxford Advanced American Dictionary
brink
noun
 
 
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