n.1. One that drives, as the operator of a motor vehicle.
2. A tool, such as a screwdriver or hammer, that is used for imparting forceful pressure on another object.
3. A machine part that transmits motion or power to another part.
4. A piece of software that enables a computer to communicate with a specific hardware device. Also called device driver.
5. A golf club with a wide head and a long shaft, used for making long shots from the tee.
6. Nautical A jib-headed spanker.