Meaning of agent

Definition of agent

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

Other information on agent

WIKIPEDIA results for agent
Amazon results for agent