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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

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

Wiktionary

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

WordNet 3.0

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

Etymologies

  1. From Latin sonus, a sound; see swen- in Indo-European roots.

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‘sonic’ has been looked up 1146 times, loved by 1 person, added to 17 lists, and has a Scrabble score of 7.