agent

noun10

1. •
   a person who has the right to act for a client, for example by making deals for them

   • He worked as an agent for the government.
2. •
   A person who looks for work for another person and brokers a deal between the hiree and hirer.
3. •
   In the client-server model, the part of the system that performs information preparation and exchange on behalf of a client or server. Especially in the phrase “intelligent agent” it implies some kind of autonomous process which can communicate with other agents to perform some collective task on behalf of one or more humans.
4. •
   Someone who works for an intelligence agency: whether an officer or employee thereof or anyone else who agrees to help their efforts (for ideology, for money, as blackmailee, or otherwise).

   • @Gary, are you a PAP agent? ... =) trying to incite rebellion and revolution on this site so that the govt will have an excuse to take down this site? — 2012
5. •
   (US) A law enforcement officer tasked with enforcing a specific field of law.

   • The Bureau of Alcohol, Tobacco, Firearms and Explosives officers are just simply referred to as "ATF agents".
6. •
   (US) A respectful term of address for an agent, especially a law enforcement agent.

   • Steve Haines (Robert Bogue): Agent Sanchez! Apprehend these suspects! — 2013
7. •
   One who exerts power, or has the power to act.
8. •
   An active power or cause or substance; something (e.g. biological, chemical, thermal, etc.) that has the power to produce an effect.
9. •
   The participant of a situation that carries out the action in this situation, e.g. "the boy" in the sentences "The boy kicked the ball" and "The ball was kicked by the boy".
10. •
    A cheat who is assisted by dishonest casino staff.

    • Nevada casinos are fleeced out of millions of dollars yearly by agents (cheats acting as players) in collusion with crooked Black Jack dealers and pit bosses. — 1978