transonic

Etymology

trans- + sonic

adj

  1. Just below, or just above the speed of sound (0.8 < Ma < 1.2 approximately).
  2. Passing from subsonic to supersonic, or vice versa.
  3. Travelling through a fluid (commonly air) at a speed where regions of supersonic and subsonic flow coexist simultaneously over different portions of the surface of the moving object in question.

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