Wikipedia:
An Agent is one who acts for, or in the place of, another, by authority from him; one entrusted with the business of another.
In philosophy
An entity which is capable of Action (philosophy)Agency (philosophy)
In sociology
A social 'agent'; See structure and agency
In law enforcement
Special agent, title for a detective or investigator for a state, county, municipal, federal or tribal governmentSecret agent, spy involved in espionage. See agents in espionage.
In law
Agent (law), in commercial law, is a person who is authorized to act on behalf of another (called the principal) to create a legal relationship with a third party
C & F Agent abbreviated from Clearing and Forwarding Agent (IN).Election agent, person legally responsible for the conduct of a candidate's political campaign (UK)Free agent, sports player whose contract with a team has expiredLiterary agent, person who represents writers and their written works to publishers, theatrical producers and film producersPress agent, professional publicist who acts on behalf of his or her client on all matters involving public relationsSports agent, person who procures and negotiates employment and endorsement deals for a playerTalent agent or booking agent, person who finds jobs for actors, musicians and models, etc., in various entertainment businessesForeign agent, person representing the interests of foreign powers, mandated by the Foreign Agents Registration Act to be identified to the American publicPatent agent or patent attorney, person who has the specialized qualifications necessary for representing clients in obtaining patents and acting in all matters and procedures relating to patent law and practiceReal estate agent or real estate broker, person who acts as an intermediary between sellers and buyers of real estateTravel agent, person who works on behalf of a travel agencyTuition agent, person who works on behalf of a tuition agency, specializing in introducing tutors to students requiring help in the academic areaYacht agent or yacht broker, specialist who acts as a representative for the sale of a yacht or boat
In economics
Agent (economics), actor and decision maker in a model
Homo economicus, concept in some economic theories of humans as rational and broadly self-interested actorsAs discussed by economists as the principal–agent problem, agent means anyone supposed to act in the interests of the principal, especially insofar as the actions of the agent cannot be completely monitored by the principal. In this sense agent includes such diverse and common roles as auto mechanic, a doctor, a lawyer, an investment advisor, any fiduciary, a contractor, any employee (from the point of view of the employer), and a political representative in a democracy.Agent-based computational economics, computational study of economic processes modeled as dynamic systems of interacting agentsRational agent, entity which has clear preferences, models uncertainty via expected values, and always chooses to perform the action that results in the optimal outcome for itself from among all feasible actionsRepresentative agent, refers to the typical decision-maker of a certain type
In medicine
A pharmacological agent is a chemical substance with pharmacological or biological activity, i.e., a pharmaceutical drug
In chemistry and warfare
Agent Orange, code name for an herbicide and defoliantBiological agent, infectious disease or toxin that can be used in bioterrorism or biological warfareChemical warfare, involves using the toxic properties of chemical substances as weapons to kill, injure, or incapacitate an enemy
Blister agent or vesicant, chemical compound that causes severe skin, eye and mucosal pain and irritationBlood agent or cyanogen agent, chemical compound carried by the blood for distribution throughout the bodyIncapacitating agent, agent that produces temporary physiological or mental effects, or both, which will render individuals incapable of concerted effort in the performance of their assigned dutiesNerve agent or nerve gases, class of phosphorus-containing organic chemicals (organophosphates) that disrupt the mechanism by which nerves transfer messages to organsPulmonary agent or choking agent, chemical weapon agent designed to impede a victim's ability to breatheRiot control agent, less-lethal lachrymatory agents used for riot control
In linguistics
Agent (grammar), the participant of a situation that carries out the action in this situation; also the name of the thematic role (also known as the thematic relation)Agent noun (or nomen agentis), word that is derived from another word denoting an action, and that identifies an entity that does that action
In computer science and artificial intelligence
Agent architecture, blueprint for software agents and intelligent control systems, depicting the arrangement of componentsAgent-based model, computational model for simulating the actions and interactions of autonomous individuals with a view to assessing their effects on the system as a wholeIntelligent agent, autonomous entity which observes and acts upon an environment and directs its activity towards achieving goalsSoftware agent, piece of software that acts for a user or other program in a relationship of agency
Forté Agent, email and Usenet news client used on the Windows operating systemUser agent, the client application used with a particular network protocol
In culture and entertainment
James Bond, most famous secret agent, fictional character by Ian Fleming.Agent 47, fictional character and protagonist in the Hitman video-game series.Agent 212, name of a humorous Belgian comic about a large police officerAgent (The Matrix), group of characters in the seriesAgent (video game), currently in development by Rockstar North for the PlayStation 3The Agent (film), 1922 film featuring Oliver HardySecret Agent (1936 film), British film directed by Alfred HitchcockAgent, version of The Mole (TV series) that aired in Poland on TVNThe Agents, superhuman characters in Seven Samurai 20XXAgents (band), a Finnish schlager/rock'n'roll bandThe Agents, a British band
