'agent' definitions:

Definition of 'agent'

From: WordNet
noun
An active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents"
noun
A representative who acts on behalf of other persons or organizations
noun
A substance that exerts some force or effect
noun
A businessman who buys or sells for another in exchange for a commission [syn: agent, factor, broker]
noun
Any agent or representative of a federal agency or bureau [syn: agent, federal agent]
noun
The semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause [syn: agentive role, agent]

Synonyms of 'agent'

From: Moby Thesaurus

Words containing 'agent'