Engineering
Engineering is the creative application of science, mathematical methods, and empirical evidence to the innovation, design, construction, operation and maintenance of structures, machines, materials, devices, systems, processes, and organizations. The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, and types of application. See glossary of engineering.
Sound
In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid.
Sound
Sonorous metal blowing martial sounds,
At which the universal host up sent
A shout that tore hell's concave, and beyond
Frighted the reign of Chaos and old Night.
John Milton, Paradise Lost (1667; 1674), Book I, line 540.