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English definition of “subsonic”

subsonic

adjective uk   /sʌbˈsɒn.ɪk/ us    /-ˈsɑː.nɪk/
slower than the speed of soundTravelling by aircraftAviationMovement through the airSlow and moving slowly
(Definition of subsonic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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