1.Definition: a businessman who buys or sells for another in exchange for a commission

Related Noun(s):broker, factor

Category: People

2.Definition: a representative who acts on behalf of other persons or organizations

Category: People

3.Definition: a substance that exerts some force or effect

Category: General

4.Definition: an active and efficient cause; capable of producing a certain effect

"Their research uncovered new disease agents"

Category: Objects

5.Definition: any agent or representative of a federal agency or bureau

Related Noun(s):federal agent

Category: People

6.Definition: the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause

Category: General