noting or pertaining to speed that is at least five times that of sound in the same medium.

1935–40; hyper- + sonic

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World English Dictionary
hypersonic (ˌhaɪpəˈsɒnɪk)
concerned with or having a velocity of at least five times that of sound in the same medium under the same conditions

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hypersonic  [%PREMIUM_LINK%]     (hī'pər-sŏn'ĭk)  Pronunciation Key 
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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Example sentences
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.
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