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transonic (not comparable)
- Just below, or just above the speed of sound (0.8 < Ma < 1.2 approximately).
- Passing from subsonic to supersonic, or vice versa.
- 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.
just above or below the speed of sound