Flywheel (noun)

1. A heavy wheel in a machine, especially an engine, used to increase its momentum and to store energy during periods of acceleration.
2. A device used to store energy and provide steady, even motion.
3. A device or mechanism that maintains stability or consistency.

Origin:

Early 19th century: from fly + wheel.

Examples:

1. The flywheel helps to keep the engine running smoothly.
2. The flywheel stored energy as the crankshaft turned.
3. The flywheel was an important component of the steam engine.
4. The flywheel provides a smooth and consistent motion for the machine.
5. The company's reputation was the flywheel of its success.