Agent - Wikipedia
https://en.wikipedia.org/wiki/Agent
WebAgent (economics), an actor and decision maker in a model; Agent (grammar), in linguistics, the thematic relation of a cause or initiator to an event; Agent noun, a word identifying an actor, derived from a word denoting an action; Cleaning agent, a substance used to remove bad smells, clutter, dirt, dust, or stains on surfaces; See also
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