Hypersonic Definition
hīpər-sŏnĭk
adjective
Designating, of, or traveling at a speed equal to five times the speed of sound or greater.
Webster's New World
(of a speed, aeronautics) Far enough above the speed of sound so as to cause significant differences in behaviour due to chemical reactions or disassociation of the air.
Wiktionary
Origin of Hypersonic
-
hyper- + sonic
From Wiktionary
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