heart·beat

[hahrt-beet]
noun Physiology.
a pulsation of the heart, including one complete systole and diastole.

Origin:
1840–50; heart + beat

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
heartbeat (ˈhɑːtˌbiːt) [Click for IPA pronunciation guide]
 
n
diastole See systole one complete pulsation of the heart

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Heartbeat is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a gadget; dingus; thingumbob.
American Heritage
Medical Dictionary

heartbeat heart·beat (härt'bēt')
n.
A single complete pulsation of the heart.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Slang Dictionary

heartbeat

n.
1. The signal emitted by a Level 2 Ethernet transceiver at the end of every packet to show that the collision-detection circuit is still connected.
2. A periodic synchronization signal used by software or hardware, such as a bus clock or a periodic interrupt.
3. The `natural' oscillation frequency of a computer's clock crystal, before frequency division down to the machine's clock rate.
4. A signal emitted at regular intervals by software to demonstrate that it is still alive. Sometimes hardware is designed to reboot the machine if it stops hearing a heartbeat. See also breath-of-life packet.
FOLDOC
Computing Dictionary

heartbeat definition


1. The signal emitted by a Level 2 Ethernet transceiver at the end of every packet to show that the collision-detection circuit is still connected.
2. A periodic synchronisation signal used by software or hardware, such as a bus clock or a periodic interrupt.
3. The "natural" oscillation frequency of a computer's clock crystal, before frequency division down to the machine's clock rate.
4. A signal emitted at regular intervals by software to demonstrate that it is still alive. Sometimes hardware is designed to reboot the machine if it stops hearing a heartbeat. See also breath-of-life packet, watchdog.
[Jargon File]
(1996-03-12)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
All living things depend on the heartbeat of seasonal change.
It can even see your heartbeat racing while you crouch behind the door.
The health care provider may hear a fast heartbeat while listening to your
  heart with a stethoscope.
In a heartbeat, hundreds of stories full of fevered theorizing gushed forth in
  the press.
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