agent
UK: ˈeɪdʒənt | US: ˈeɪdʒənt
n. a person or entity authorized to act on behalf of another
n. a substance or force that produces a specific effect
n. a representative, such as a spy or business intermediary
The word "agent" originates from Latin agere (to do, drive, or act), combined with the suffix -ent, which forms nouns indicating "one who does something." Over time, it evolved through Old French agent before entering Middle English, retaining its core meaning of "one who acts." The logical progression reflects the concept of delegation—whether in law, science, or espionage—where an "agent" performs actions for another entity.
The real estate agent helped us find our dream home.
Baking soda is a common leavening agent in recipes.
The secret agent completed the mission undetected.
She appointed her lawyer as her legal agent.
The cleaning agent removed the stubborn stain effectively.