1. An active and efficient cause;
    Capable of producing a certain effect (synset 109213796)
    "their research uncovered new disease agents"
  2. A representative who acts on behalf of other persons or organizations (synset 109796794)
  3. A substance that exerts some force or effect (synset 114802595)
  4. A businessman who buys or sells for another in exchange for a commission (synset 109796453)
  5. Any agent or representative of a federal agency or bureau (synset 110393500)
  6. The semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause (synset 106343357)

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