clock

clock1 (klɒk)
—n
1.	digital clock Compare watch a timepiece, usually free-standing, hanging, or built into a tower, having mechanically or electrically driven pointers that move constantly over a dial showing the numbers of the hours
2.	any clocklike device for recording or measuring, such as a taximeter or pressure gauge
3.	the downy head of a dandelion that has gone to seed
4.	an electrical circuit that generates pulses at a predetermined rate
5.	computing an electronic pulse generator that transmits streams of regular pulses to which various parts of the computer and its operations are synchronized
6.	short for time clock
7.	around the clock, round the clock all day and all night
8.	the clock speedometer an informal word for mileometer
9.	(Brit) a slang word for face
10.	against the clock
	a.  under pressure, as to meet a deadline
	b.  (in certain sports, such as show jumping) timed by a stop clock: the last round will be against the clock
11.	put the clock back to regress
—vb
12.	slang (Brit), (Austral), (NZ) (tr) to strike, esp on the face or head
13.	slang (Brit) (tr) to see or notice
14.	(tr) to record time as with a stopwatch, esp in the calculation of speed
15.	electronics to feed a clock pulse to (a digital device) in order to cause it to switch to a new state
[C14: from Middle Dutch clocke clock, from Medieval Latin clocca bell, ultimately of Celtic origin]
'clocker1
—n
'clocklike1
—adj

clock

is 1941, originally Australian, probably from earlier slang clock (n.) "face" (1923). O'clock for of the clock is c.1720.

clock definition tv. to earn, score, or total up someone or something. (As if the person or thing gained were being metered or clocked.) : Sam clocked a date with Sally, and is he ever proud!

clock definition

processor
A circuit in a processor that generates a regular sequence of electronic pulses used to synchronise operations of the processor's components. The time between pulses is the cycle time and the number of pulses per second is the clock rate (or frequency).
The execution times of instructions on a computer are usually measured by a number of clock cycles rather than seconds. Clock rates for various models of the computer may increase as technology improves, and it is usually the relative times one is interested in when discussing the instruction set.
(1994-12-16)

clock

In addition to the idioms beginning with clock, also see against the clock; beat the clock; clean someone's clock; like clock-work; set back (the clock); stop someone's clock; stop the clock.