A graduated, circular scale over which a needle moves to show a measurement (such as speed).

A clock face.

A sundial.

A panel on a radio etc showing wavelengths or channels; a knob that is turned to change the wavelength etc.

A disk with finger holes on a telephone; used to select the number to be called.

(UK, Australia, slang) A person's face.

A miner's compass.

(transitive) To control or select something with a dial, or (figuratively) as if with a dial.

(transitive) To select a number, or to call someone, on a telephone.

(intransitive) To use a dial or a telephone.