Definition of “agent”
noun:
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One who exerts power, or has the power to act; an actor.
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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.
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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.
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In the client-server model, the part of the system that performs information preparation and exchange on behalf of a client or server.
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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".
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