Definition
| • | Acting; -- opposed to patient, or sustaining, action. |
| • | One who exerts power, or has the power to act; an actor. |
| • | 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. |
| • | 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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