What is the meaning of the word "mach"?

Mach numbers are critical for understanding the aerodynamic properties of vehicles, particularly their drag and lift characteristics, and are crucial for the design of aircraft, rockets, and other high-speed vehicles.

Definitions:

Commonly used in aeronautics and aerospace engineering to describe the speed of an aircraft and other projectiles. NOUN
- The pilot pushed the aircraft to its maximum mach, navigating through the stratosphere.
Refers to the ratio of an object's speed relative to the speed of sound in the surrounding medium. NOUN
- The sleek mach of the sports car left other vehicles in its dust.