What does agent mean?
The definition of agent
A”gent, a.
Etym: [L. agens, agentis, p. pr. of agere to act; akin to Gr. aka to drive, Skr. aj.

Actingpatient, or sustaining, action. [Archaic] “The body agent.” Bacon.

A”gent, n.
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; as, a physical, chemical, or medicinal agent; as, heat is a powerful agent.