Contractor (noun)

1. A person or company that enters into a contract to provide goods or services to another person or company.
2. A person or organization that is engaged in the business of constructing or repairing buildings, roads, bridges, or other structures.
3. A person who has entered into a contract to undertake a specific task or project.

Origin:

From latin contractus ("drawn together, contracted"), from contrahere ("to draw together"), from con- ("together") + trahere ("to dra.w")

Examples:

1. He hired a contractor to build the house.
2. The contractor was responsible for the construction of the bridge.
3. The company hired a contractor to provide security services.
4. The contractor was responsible for the maintenance of the building.
5. She was a freelance contractor for the company.