agent


From The Collaborative International Dictionary of English v.0.48:

Agent \A"gent\, a. [L. agens, agentis, p. pr. of agere to act;
   akin to Gr. ? to lead, Icel. aka to drive, Skr. aj. [root]2.]
   Acting; -- opposed to patient, or sustaining, action.
   [Archaic] "The body agent." --Bacon.
   [1913 Webster]
.

From The Collaborative International Dictionary of English v.0.48:

Agent \A"gent\, n.
   1. One who exerts power, or has the power to act; an actor.
      [1913 Webster]

            Heaven made us agents, free to good or ill.
                                                  --Dryden.
      [1913 Webster]

   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.
      [1913 Webster]

   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.
      [1913 Webster]

   4. (Biochem., Med.) a chemical substance having biological
      effects; a drug.
      [PJC]
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