What is the definition of “driver” and what is the full definition of the term?

[39] The defendant provides a definition of “driver” that reads “one employed in conducting a coach, carriage, wagon, or other vehicle”. This is from the Fourth Edition of Black’s Law Dictionary. However, the full definition of this term, from the revised Fourth Edition, is as follows: “One employed in conducting or operating a coach, carriage, wagon, or other vehicle, with horses, mules, or other animals, or a bicycle, tricycle or motor car, through not a street railroad car. A person actually doing driving, whether employed by owner to drive or driving his own vehicle.” This is taken from Wallace v. Woods, 340 M. 452, 102 S.W. 2d 91 @ 97, a 1936 case from Missouri.