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subsonic vs. supersonic

[ suhb-son-ik ]
  1. noting or pertaining to a speed less than that of sound in air at the same height above sea level.
  2. infrasonic.
[ soo-per-son-ik ]
  1. greater than the speed of sound waves through air.
  2. capable of achieving such speed: a supersonic plane.
  3. ultrasonic.

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