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