|Origin:||Latin dies 'day'|
the round part of a clock, watch, machine etc that has numbers that show you the time or a measurement:
The lighted dial of her watch said 1.20.
She looked at the dial to check her speed.
the part of a piece of equipment such as a radio or thermostat that you turn around to do something, such as find a different station or change the temperature:
The dial on the heater was set to 'HOT'.
the wheel on an older telephone with numbered holes for your fingers that you move around in order to make a call