Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of or relating to aerodynamic flow or flight conditions at speeds near the speed of sound.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective just below, or just above the speed of sound
  • adjective passing from subsonic to supersonic, or vice versa

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

  • adjective (of speed) having or caused by speed approximately equal to that of sound in air at sea level

Etymologies

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

[tran(s)– + sonic.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

trans- +‎ sonic

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