faster than the speed of sound in the surrounding air The speed of sound (called Mach 1 0) varies from about 760 mph (1,225 km/h) in warm air at sea level to about 661 mph (1,060 km/h) in very cold air at great heights
(of speed) greater than the speed of sound in a given medium (especially air); "a supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon"
having frequencies above those of audible sound (of speed) greater than the speed of sound in a given medium (especially air); "a supersonic bomber flies so fast that it must release its bombs while the target is still over the horizon