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heartbeat

 [hahrt-beet]  

heart·beat

   [hahrt-beet]
noun Physiology.
a pulsation of the heart, including one complete systole and diastole.
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Origin:
1840–50; heart + beat
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Heartbeat is always a great word to know.
So is vicarious. Does it mean:
any function of the body that is essential for life
noting or pertaining to a situation in which one organ performs part of the functions normally performed by another
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Collins
World English Dictionary
heartbeat (ˈhɑːtˌbiːt)
 
—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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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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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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