Mechanic (noun)

1. A person who repairs or maintains machinery, vehicles, or equipment.
2. A person who works with machines or machinery.
3. A person skilled in the practical application of a scientific or technical subject.

Origin:

Late middle english (originally denoting a person skilled in the mechanical arts): from old french mecanique, from latin mechanicus, from greek mēkhanikos, from mēkhanē "a machine, mechanical art".

Examples:

1. She hired a mechanic to fix her car.
2. The mechanic checked the engine and found the problem.
3. The mechanic gave the vehicle a thorough inspection.
4. He was trained as a mechanic in the army.
5. The mechanic was able to repair the complex machinery with ease.