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[hahy-per-son-ik] /ˌhaɪ pərˈsɒn ɪk/
noting or pertaining to speed that is at least five times that of sound in the same medium.
Origin of hypersonic
1935-40; hyper- + sonic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hypersonic
  • The goal of the program is to produce an economically viable, environmentally comparable, quiet hypersonic airplane.
  • Their vast symmetrical shapes outline hypersonic shock waves produced by colliding shells of stellar gas.
  • Moving at hypersonic speeds, it compresses the gas violently, and the gas heats up.
British Dictionary definitions for hypersonic


concerned with or having a velocity of at least five times that of sound in the same medium under the same conditions
Derived Forms
hypersonics, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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hypersonic in Science
Relating to or capable of speeds equal to or exceeding five times the speed of sound (Mach 5 and above). Compare subsonic, supersonic, transonic.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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