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1.
an active and efficient cause; capable of producing a certain effect
their research uncovered new disease agents
2.
a substance that exerts some force or effect
3.
a representative who acts on behalf of other persons or organizations
4.
a businessman who buys or sells for another in exchange for a commission
5.
any agent or representative of a federal agency or bureau
6.
the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause
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