1. 
   Leap Second
   A second which may be added or subtracted to adjust UTC at either, both, or neither, of two specific opportunities each year.
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   leap second
   [n] - a second (as measured by an atomic clock) added to or subtracted from Greenwich Mean Time in order to compensate for slowing in the Earth`s rotation
   Found op http://www.webdictionary.co.uk/definition.php?query=leap%20second
   
   
3. 
   leap second
   noun a second (as measured by an atomic clock) added to or subtracted from Greenwich Mean Time in order to compensate for slowing in the Earth`s rotation
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=leap%20second
   
   
4. 
   leap second
   Coordinated Universal Time
   Found op http://foldoc.org/leap+second
   
   
5. 
   Leap second
   A leap second is a positive or negative one-second adjustment to the Coordinated Universal Time (UTC) time scale that keeps it close to mean solar time. UTC, which is used as the basis for official time-of-day radio broadcasts for civil time, is maintained using extremely precise atomic clocks. To ...
   Found op http://en.wikipedia.org/wiki/Leap_second
   
   
6. 
   leap second
   an extra second added at the end of a day (June 30 or December 31) to realign timekeeping with the earth's rate of rotation. See day for details.
   Found op http://www.unc.edu/~rowlett/units/dictL.html
   
   
7. 
   leap second
   A second sometimes inserted at the end of a calendar year to keep atomic clock time in close agreement with the rotation of the Earth, which is gradually slowing.
   Found op http://www.daviddarling.info/encyclopedia/L/leap_second.html
   
   
8. 
   Leapsecond
   "4 example of {tl|note label}" In text area: ---- In References or Footnote section: ...
   Found op http://en.wikipedia.org/wiki/Leapsecond
   
   

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