1 In aerodynamics, of or pertaining to the speed of sound; that which moves at acoustic velocity as in sonic flow ; designed to operate or perform at the speed of sound, as in sonic leading edge
having to do with the velocity (speed) of sound (specifically as opposed to ultrasonic, q v ) Some cleaning devices are labelled as "SONIC" to possibly imply that they operate ultrasonically, whereas in fact they merely vibrate parts without generating caviation
Sonic is used to describe things related to sound. He activated the door with the miniature sonic transmitter. relating to sound, sound waves, or the speed of sound (sonus; SOUND)