Definition of "Dial" :

noun: the face of a timepiece; graduated to show the hours

noun: a disc on a telephone that is rotated a fixed distance for each number called

noun: the circular graduated indicator on various measuring instruments

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

verb: choose by means of a dial

"Dial a telephone number."

verb: operate a dial to select a telephone number

"You must take the receiver off the hook before you dial."