Definitions

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

  • noun The sudden sharp increase in aerodynamic drag experienced by aircraft approaching the speed of sound.

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

  • noun sound barrier

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

  • noun the increase in aerodynamic drag as an airplane approaches the speed of sound

Etymologies

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Examples

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