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hypersonic

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hypersonic

concerned with or having a velocity of at least five times that of sound in the same medium under the same conditions
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

hypersonic

[¦hī·pər′sän·ik]
(acoustics)
Pertaining to frequencies above 500 megahertz.
(fluid mechanics)
Pertaining to hypersonic speeds, or air currents moving at hypersonic speeds.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

hypersonic

hypersonic
A hypersonic plane.
Speeds equal to, or in excess of, five times the speed of sound.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved

speed of sound

Sound waves travel at approximately 750 mph at sea level, but slow down at higher altitudes. The speed of sound is called "Mach 1." Supersonic refers to speeds from Mach 1 to Mach 5 (1 to 5 times the speed of sound), and hypersonic ranges from Mach 5 to Mach 10 (5x to 10x).
Copyright © 1981-2025 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
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References in periodicals archive
North American US Air Force Maj Gen (retired) Robert White, the first pilot to fly hypersonically, at Mach 5 and at Mach 6, and holder of the world's absolute altitude record since a 1962 X-15 flight to 314,688ft (95,900m) died on 17 March.
Aerospace & Defense News - Technology North America
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