device consisting of a piece of machinery; has moving parts that perform some function

control mechanism for keeping an automobile at a set speed

the control on a radio or television set that is used for tuning

(computer science) a circuit or chip that translates commands into a form that can control a hard disk drive

a control that maintains a steady speed in a machine (as by controlling the supply of fuel)

control consisting of a wheel whose rim serves as the handle by which a part is operated