# hypersonic

> English word · Adjective · frequency rank #51,169

## Definitions
1. Of a speed, equal to, or greater than, or capable of achieving, five times the speed of sound.
2. Of a speed, far enough above the speed of sound as to cause significant differences in behaviour due to chemical reactions or dissociation of the air.

## Etymology
From hyper- + sonic. Doublet of supersonic.

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