Supersonic vs. Hypersonic

Supersonicadjective

(of a speed) greater than the speed of sound (in the same medium, and at the same temperature and pressure)

Supersonicadjective

ultrasonic, having a frequency too high to be audible

Supersonicnoun

An aircraft that can travel at the speed of sound.

Supersonicadjective

Moving at a speed greater than the speed of sound in air; - this speed varies with altitude, since the speed of sound varies with altitude, as well as with temperature and humidity, being approximately 1129 feet per second at sea level and 984 feet per second at 16 miles altitude.

Supersonicadjective

Capable of moving at speeds higher than the speed of sound; - of aircraft.

Supersonicadjective

(of speed) greater than the speed of sound in a given medium (especially air);

Supersonicadjective

having frequencies above those of audible sound

Supersonicadjective

involving or denoting a speed greater than that of sound

Hypersonicadjective

equal to, or greater than, or capable of achieving, five times the speed of sound.

Hypersonicadjective

far enough above the speed of sound as to cause significant differences in behaviour due to chemical reactions or disassociation of the air.

Hypersonicnoun

Pertaining to or moving at a speed greatly in excess of the speed of sound, usually meaning greater than mach 5. All speeds in excess of the speed of sound are supersonic, but to be hypersonic requires even higher speed.