driv·er 
/ˈdraɪvɚ/ noun
plural driv·ers /ˈdraɪvɚ/ noun [count] 1 a : a person who drives a car, truck, etc.
▪ Who was the driver at the time of the accident? ▪ He's a good/careful/fast/bad driver. ▪ The front door on the driver's side [=the side of the car where the driver sits] is scratched. — see also backseat driver
b : a person whose job is to drive a vehicle (such as a taxi, truck, or bus)
▪ We told the taxi driver to take us to the library. ▪ He likes to sit at the front of the bus, near the driver. ▪ an ambulance/truck driver 2 technical : a piece of computer software that controls a device (such as a mouse or printer) that is attached to the computer
▪ There's a problem with the printer's driver. 3 golf : a club that is used for hitting long shots off a tee
▪ Who was the driver at the time of the accident? ▪ He's a good/careful/fast/bad driver. ▪ The front door on the driver's side [=the side of the car where the driver sits] is scratched. — see also backseat driver
b : a person whose job is to drive a vehicle (such as a taxi, truck, or bus)
▪ We told the taxi driver to take us to the library. ▪ He likes to sit at the front of the bus, near the driver. ▪ an ambulance/truck driver
▪ There's a problem with the printer's driver.
in the driver's seat
: in a position in which you are able to control what happens
▪ When his boss went on vacation, he suddenly found himself in the driver's seat.
▪ When his boss went on vacation, he suddenly found himself in the driver's seat.
— see also pile driver
