# transonic

> English word · Adjective

## Definitions
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.

## Etymology
From trans- + sonic.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/transonic