a plate, disk, face, or other surface containing markings or figures upon which the time of day is indicated by hands, pointers, or shadows, as of a clock or sundial.
2.
a plate or disk with markings or figures for indicating or registering some measurement or number, as of pressure, number of revolutions, the frequency to which a radio is tuned, etc., usually by means of a pointer.
3.
a rotatable plate, disk, or knob used for regulating a mechanism, making and breaking electrical connections, etc., as in tuning a radio or television station in or out.
4.
Also called rotary dial.a rotatable plate or disk on a telephone, fitted with finger holes that are marked with letters or numbers, used in making calls through an automatic switchboard.
5.
any mechanism on the face of a telephone by which the caller places a call, as push buttons.
dial up, to obtain, reach, or contact by telephone: to dial up stock-market information; to dial up Chicago and do some business.
Origin: 1400–50; late Middle English: instrument for telling time by the sun's shadow, presumably < Medieval Latin diālis daily (Latin di(ēs) day + -ālis-al1)