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

A clock face.

A sundial.

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

“President Trump has recently dialled down the rhetoric.”

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

“In an emergency dial 999.”

To use a dial or a telephone.

“Please be careful when dialling.”