definition of an agent
agent. n. 1. a person who acts on behalf of another person, group, business, government, etc; representative. 2. a person or thing that acts or has the power to act.3. a phenomenon, substance, or organism that exerts some force or effect: a chemical agent.4. the means by which something occurs or is achieved; instrument: wind is an agent of plant pollination. 5.gent. n. 1. a person who acts on behalf of another person, group, business, government, etc; representative. 2. a person or thing that acts or has the power to act.