leap second

noun
an extra second intercalated into the world's timekeeping system about once a year, made necessary by the gradual slowing down of the earth's rotation.

Origin:
1970–75

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To leap second
Collins
World English Dictionary
leap second
 
n
a second added to or removed from a scale for reckoning time on one particular occasion, to synchronize it with another scale

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
American Heritage
Science Dictionary
leap second   (lēp)  Pronunciation Key 
A second of time, as measured by an atomic clock, added to or omitted from official timekeeping systems annually to compensate for changes in the rotation of the Earth. See more at coordinated universal time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Cultural Dictionary

leap second definition


A second inserted into the year to make up for the fact that the Earth's rotation is slowing down.

Note: Scientists know when to insert a leap second by comparing the Earth's rotation to an atomic clock.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
FOLDOC
Computing Dictionary

leap second definition


Coordinated Universal Time

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
Cite This Source
Example sentences
Astronomers use rotational time to aim telescopes, so they favor the leap second.
It was because of the leap second that strobes had been added to the ball.
Naif kernel file to be used for the leap second in place of the automated leap second kernel.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature
FAVORITES
RECENT

;