the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause | (genetics) a virus or other agent that is used to deliver DNA to a cell |
an active and efficient cause; capable of producing a certain effect | a variable quantity that can be resolved into components |
a businessman who buys or sells for another in exchange for a commission | any agent (person or animal or microorganism) that carries and transmits a disease |
a representative who acts on behalf of other persons or organizations | a straight line segment whose length is magnitude and whose orientation in space is direction |
any agent or representative of a federal agency or bureau | |
a substance that exerts some force or effect | |