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From Latin agÄ“ns, present active participle of agere ("to drive, lead, conduct, manage, perform, do").

Full definition of agent

(plural agents)

One who acts for, or in the place of, another (the principal), by authority from him; one intrusted with the business of another; a substitute; a deputy; a factor.

I see in him Dick outrageous strength, with an inscrutable malice sinewing it. That inscrutable thing is chiefly what I hate; and be the white whale agent, or be the white whale principal, I will wreak that hate upon him. --Herman Melville, , ch. 36

An active power or cause; that which has the power to produce an effect; as, a physical, chemical, or medicinal agent; as, heat is a powerful agent.
(computing) 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 â€œintelligent agentâ€ 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.
(grammar) 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".