from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to audible sound: a sonic wave.
  • adj. Having a speed approaching or being that of sound in air, about 1,220 kilometers (760 miles) per hour at sea level.
  • adj. Slang Extremely exciting and fast-paced: a sonic lifestyle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of or relating to sound
  • adj. having a speed approaching that of the speed of sound in air

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. (of speed) having or caused by speed approximately equal to that of sound in air at sea level
  • adj. relating to audible sound


From Latin sonus, a sound; see swen- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin sonus. (Wiktionary)



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