i Register
In some senses, supersonic is marked as colloquial. Watch for register when choosing this word.
supersonic
adj 2noun 1
Definitions
adj
1
Greater than the speed of sound (in the same medium, and at the same temperature and pressure).
supersonic jet
supersonic movement
2
Ultrasonic, having a frequency too high to be audible.
noun
1
An aircraft that can travel at the speed of sound.
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