Hypersonic

adj. faster than the speed of sound

In aerodynamics, hypersonic speeds are speeds that are highly supersonic. In the 1970s, the term generally came to refer to speeds of Mach 5 (5 times the speed of sound) and above. The hypersonic regime is a subset of the supersonic regime. Supersonic airflow is decidedly different from subsonic flow. Nearly everything about the way an aircraft flies changes dramatically as an aircraft accelerates to supersonic speeds. Even with this strong demarcation, there is still some debate as to the definition of "supersonic". One definition is that the aircraft, as a whole, is traveling at Mach 1 or greater. More technical definitions state that you are only supersonic if the airflow over the entire aircraft is supersonic, which occurs around Mach 1.2 on typical designs. The range Mach 0.8 to 1.2 is therefore considered transonic.
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Of or pertaining to speeds equal to, or in excess of, 5 times the speed of sound. See also speed of sound. 1/3/73

Qui a ou qui se rapporte à une vitesse égale ou supérieure à cinq fois la vitesse du son. Voir aussi vitesse du son. 1/3/73

hypersonic
tính từ (thuộc) tốc độ nhanh hơn 5 lần của âm thanh (thuộc) tần số âm thanh cao hơn 1 ngàn triệu héc
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IPERSONICO