- noun a timing signal to which all components in a system are synchronised
- In a computer, a circuit or device which provides a steady stream of timed pulses. This clock serves as the internal timing reference of a digital computer, upon which all its operations depend. Also known as main clock, or system clock.
- A clock which generates pulses which control other clocks, or help maintain their accuracy.
- A clock which generates pulses which control other devices, equipment, or systems.