the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause | one that hardens, especially a substance added to varnish or paint to give it a harder surface or finish. |
an active and efficient cause; capable of producing a certain effect | |
a businessman who buys or sells for another in exchange for a commission | |
a representative who acts on behalf of other persons or organizations | |
any agent or representative of a federal agency or bureau | |
a substance that exerts some force or effect | |