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sonic

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Adjective sonic has 2 senses
  1. sonic, transonic - (of speed) having or caused by speed approximately equal to that of sound in air at sea level; "a sonic boom"
    Antonyms: subsonic, supersonic
  2. sonic - relating to audible sound; "a sonic wave"
    Antonyms:
    inaudible, unhearable (indirect, via audible)
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