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