noun
transonic speed
Technical term in aerodynamics referring to speeds near the speed of sound, typically Mach 0.8–1.2.
遷音速領域では衝撃波が発生しやすい。
Shock waves tend to form in the transonic speed range.
Compound of 遷 (transition) + 音速 (speed of sound), referring to the transitional speed range around Mach 1.