■ adjective
1》 relating to speeds of more than five times the speed of sound (Mach 5).
2》 relating to sound frequencies above about a thousand million hertz.
Derivatives
~ally adverb
■ adjective
1》 relating to speeds of more than five times the speed of sound (Mach 5).
2》 relating to sound frequencies above about a thousand million hertz.
Derivatives
~ally adverb
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004