agent
US /ˈeɪ.dʒənt/
UK /ˈeɪ.dʒənt/
1.
a person who acts on behalf of another person or group
:
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She works as a real estate agent.
•
The sports agent negotiated a new contract for the player.
2.
a person or thing that takes an active role or produces a specified effect
:
•
Water is a powerful eroding agent.
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The police identified the chemical agent used in the attack.
3.
a secret operative or spy
:
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The secret agent infiltrated the enemy organization.
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He was suspected of being a foreign agent.