The noun agency has 5 senses (first 3 from tagged texts)
1. (21) agency, federal agency, government agency, bureau, office, authority -- (an administrative unit of government; "the Central Intelligence Agency"; "the Census Bureau"; "Office of Management and Budget"; "Tennessee Valley Authority")
2. (6) agency -- (a business that serves other businesses)
3. (1) agency -- (the state of being in action or exerting power; "the agency of providence"; "she has free agency")
4. representation, delegacy, agency -- (the state of serving as an official and authorized delegate or agent)
5. means, agency, way -- (how a result is obtained or an end is achieved; "a means of control"; "an example is the best agency of instruction"; "the true way to success")