noun
plural -ers
[count] a person who drives a car, truck, etc.
a person whose job is to drive a vehicle (such as a taxi, truck, or bus)
technical :a piece of computer software that controls a device (such as a mouse or printer) that is attached to the computer
golf :a club that is used for hitting long shots off a tee - see also pile driver
in the driver's seat
in a position in which you are able to control what happens