noun
    
    plural agents
    
    [count] a person who does business for another person :a person who acts on behalf of another
    
    
    
    
    
    
    
    a person who tries to get secret information about another country, government, etc. :spy, secret agent
    
    
    
    a person or thing that causes something to happen
    
    
    
    something (such as a chemical) that is used to produce a particular effect or result