agent /ˈeʤənt/ 名詞
A·gent a. Acting; -- opposed to patient, or sustaining, action. [Archaic] “The body agent.”
1. One who exerts power, or has the power to act; an actor.
Heaven made us agents, free to good or ill. --Dryden.
2. One who acts for, or in the place of, another, by authority from him; one intrusted with the business of another; a substitute; a deputy; a factor.
3. An active power or cause; that which has the power to produce an effect, such as a physical, chemical, or medicinal agent; as, heat is a powerful agent.
n 1: an active and efficient cause; capable of producing a
certain effect; "their research uncovered new disease
2: a substance that exerts some force or effect
3: a representative who acts on behalf of other persons or
4: a businessman who buys or sells for another in exchange for
a commission [syn: factor, broker]
5: any agent or representative of a federal agency or bureau
[syn: federal agent]
6: the semantic role of the animate entity that instigates or
causes the hapening denoted by the verb in the clause
[syn: agentive role]