Agency (noun)

1. A person or thing that takes action or produces a particular effect.
2. An organization that provides a particular service, especially one that is responsible for a government function.
3. An organization that acts as a representative for another, often in commercial matters.

Origin:

Late middle english: from latin agēns, agent- 'doing, acting', from the verb agere.

Examples:

1. The agency is responsible for enforcing the law.
2. The agency provides assistance to those in need.
3. The agency acted as an intermediary between the two companies.
4. The agency was established to address environmental issues.
5. The agency serves as a liaison between the government and the public.