agent - definition and synonyms

noun [countable] 

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  1. 2
    someone who works for a country’s secret service and collects secret information about foreign governments
     Synonyms and related words
    1. a.
      an official of some US government departments, such as the FBI

      Agent Lehman spoke with the police about the case.

  2. 3
    a chemical or other substance that has a particular effect
    1. a.
      formal something that causes change
      agent of:

      Soil erosion is a major agent of environmental change.

       Synonyms and related words