1. Having, caused by, or relating to a speed greater than the speed of sound in a given medium, especially air; being, or relating to speeds from one to five times the speed of sound in air; speeds greater than five times the speed of sound are usually referred to as hypersonic.
2. Capable of moving, or utilizing air currents moving at supersonic speed.
3. Of or relating to sound waves beyond human audibility.

Any speed over the speed of sound, that is approximately 343 miles per second, 1,087 feet per second, 761 miles per hour or 1,225 kilometers per hour in the air or at sea level, is said to be "supersonic".

Speeds greater than five times the speed of sound are sometimes referred to as hypersonic.