Hypersonic meaning

hī'pər-sŏn'ĭk
Of, relating to, or capable of speed equal to or exceeding five times the speed of sound.
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Designating, of, or traveling at a speed equal to five times the speed of sound or greater.
adjective
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Relating to or capable of speeds equal to or exceeding five times the speed of sound (Mach 5 and above).
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(of a speed, aviation) Equal to, or greater than, or capable of achieving, five times the speed of sound.
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(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.
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Origin of hypersonic

hyper- +‎ sonic