D defs.my
Entry 5 senses · 2 variants Webster, 1913

Agent

/āj'-ənt/ · A·gent · IPA /ˈeɪ.d͡ʒənt/
01 a. Acting; -- opposed to patient, or sustaining, action.
  1. 1.
    Acting; -- opposed to patient, or sustaining, action.[Archaic]
02 n. One who exerts power, or has the power to act; an actor.
  1. 1.
    One who exerts power, or has the power to act; an actor.
    “Heaven made us agents, free to good or ill.” Dryden.
  2. 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. 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.
  4. 4.
    a chemical substance having biological effects; a drug.(Biochem., Med.)