agency (Noun) — An administrative unit of government. ex. "the Central Intelligence Agency"
agency (Noun) — A business that serves other businesses.
agency (Noun) — The state of being in action or exerting power. ex. "the agency of providence" ex. "she has free agency"
agency (Noun) — The state of serving as an official and authorized delegate or agent.
agency (Noun) — How a result is obtained or an end is achieved. ex. "an example is the best agency of instruction"