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Leap second

Video footage: Countdown of leap second adjustment on January 1, 2017
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Definition of the noun leap second

What does leap second mean as a name of something?


  1. 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
    • lexical domain: Time - nouns denoting time and temporal relations
    • more generic words: s / sec / second = 1/60 of a minute

Alternative definition of the noun leap second


  1. A second of time added to the year occasionally to compensate for variation in the rate of Earth's rotation relative to the absolute standards of time.

Printed dictionaries and other books with definitions for Leap second

Click on a title to look inside that book (if available):

Google previewA Dictionary of Weights, Measures, and Units (2002)

by Donald Fenna

leap second time A second of time added to the duration of a day, as measured by the atomic clock, to maintain consistency with the ...

Google previewDictionary of Astronomy (1997)

by Martin Ince

Leap second sites in Washington State and Louisiana in the United States, had many technical, financial and political problems laser ranging Use of lasers for precise distance finding. On Earth, surveyors and others use lasers as accurate, ...

Google previewThe Facts on File Dictionary of Astronomy (2009)

by John Daintith, William Gould

leap second See universal ...


leap second an extra second added periodically to official clocks, since very precise modern clocks have shown that the Earth's rotation is slowing down so the ...

Google previewCommunications Standard Dictionary (2012)

by Martin Weik

The added or deleted second is called a leap second. Twice yearly, during the last minute of the day on June 30 and December 31, Universal Time (UT), adjustments may be made to ensure that the accumulated difference between UTC and ...

Google previewMacmillan Dictionary of Astronomy (1985)

by Valerie Illingworth

leap second.

Google previewFiber Optics Illustrated Dictionary (2002)

by J.K. Petersen

and leap year/ leap second status. WWVB uses two top-loaded dipole antennas utilizing four ...

Google previewThe Encyclopedia of Physics (2013)

by Robert Besancon

When UT1 accumulates nearly an entire second error relative to UTC, the UTC clocks are reset one complete second, called a “leap second.” - The rate of rotation of the earth is variable at a few parts in ten to the eighth. (Atomic clocks are ...

Google previewThe New American Cyclopaedia: a Popular Dictionary of General Knowledge (1863)

by George Ripley, Charles Anderson Dana

Bight base First leap Second leap Steady pin Joint screw Base screw Bear sigh t ass'mbl'd Front sight Breech screw . . Cone Vent screw Barrel Tang screw Upper band. . . . Middle ** .... Lower " .... Upper band spring Middle " Lower ** Lock ...

Google previewFirefly Astronomy Dictionary (2003)

by John Woodruff

leap second The adjustment of one second in the radio time signal at midnight on June 30 or December 31. By international agreement the ...

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Leap Second

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Leap second Meaning

Video shows what leap second means. A second of time added to the year occasionally to compensate for variation in the rate of Earth's rotation relative to the ...

Quotes about Leap second

Couldn't select: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'leap second"" IN BOOLEAN MODE) LIMIT 1,1' at line 1

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