Coupling (noun)

1. A device or mechanism for connecting two parts or components.
2. A device or mechanism that joins two separate objects together.
3. A component that joins two shafts together in a mechanical system.
4. A part or component that links or connects other parts or components.
5. A mechanical component that connects or links two objects or systems together.

Origin:

From the old french word couple, meaning 'pair, two'.

Examples:

1. The new coupling was designed to improve the efficiency of the mechanical system.
2. The old coupling was replaced with a stronger and more durable component.
3. The coupling was an important component in transmitting power and motion between parts.
4. The coupling allowed the two parts to rotate together while still maintaining a fixed distance.
5. The coupling was a simple but critical component in the operation of the machine.