agent

The definition of an agent is a person or group of people that represent another person or that takes action for other people.

(noun)

Someone who schedules appearances for a musical group is an example of an agent.

An agent is defined as someone or something that makes something happen.

(noun)

A bee taking pollen from flower to flower is an example of the bee being an agent for pollination.

See agent in Webster's New World College Dictionary

noun

a person or thing that performs an action or brings about a certain result, or that is able to do so
an active force or substance producing an effect: a chemical agent
a person, firm, etc. empowered to act for another
☆ a representative of a government agency: revenue agent
☆ Informal a traveling salesperson
Gram. the word or words designating the person or thing that performs the action of the verb in a sentence

Origin: L agens (gen. agentis), prp. of agere, act

intransitive verb, transitive verb

to act or work as an agent (on)

See agent in American Heritage Dictionary 4

noun

One that acts or has the power or authority to act.
One empowered to act for or represent another: an author's agent; an insurance agent.
A means by which something is done or caused; instrument.
A force or substance that causes a change: a chemical agent; an infectious agent.
A representative or official of a government or administrative department of a government: an FBI agent.
A spy.
Linguistics The noun or noun phrase that specifies the person through whom or the means by which an action is effected.