Definition of sonic
1 : utilizing, produced by, or relating to sound waves sonic altimeter broadly : of or involving sound sonic pollution
2 : having a frequency within the audibility range of the human ear —used of waves and vibrations
3 : of, relating to, or being the speed of sound in air or about 761 miles per hour (1224 kilometers per hour) at sea level at 59°F (15°C)
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