Plain English Meaning

Moving faster than sound travels through the air around you.

Full Definition

A speed greater than the speed of sound. In aerodynamics, the speed of sound varies with air temperature and altitude, so supersonic flight is defined relative to local conditions rather than a fixed number in miles per hour or knots.

Context Anchor

Seen in high-speed flight, aircraft performance, and aerodynamic discussions, especially when describing speeds above the speed of sound.

Derivation

From Latin 'super' meaning 'above' or 'beyond,' and 'sonic' from 'sonus' meaning 'sound.' Literally, 'beyond sound' — beyond the speed at which sound travels.