Subsonic vs. Supersonic

Subsonicadjective

(of a sound, scientific) having a frequency too low to be audible

Subsonicadjective

(of a sound, literary) very quiet, almost inaudible

Subsonicadjective

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

Subsonicadjective

with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)

Subsonicnoun

an aircraft whose maximum speed is less than the speed of sound

Subsonicadjective

(of speed) less than that of sound in a designated medium;

Subsonicadjective

relating to or flying at a speed or speeds less than that of sound

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