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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.
leap second
noun
- a second added to or removed from a scale for reckoning time on one particular occasion, to synchronize it with another scale
leap second
/ lēp /
- 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
leap second
- A second inserted into the year to make up for the fact that the Earth 's rotation is slowing down.
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Notes
Scientists know when to insert a leap second by comparing the Earth's rotation to an atomic clock .
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Word History and Origins
Origin of leap second1
First recorded in 1970–75
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Example Sentences
This is known as a "negative leap second."
From BBC
There’s even a leap second occasionally, but there’s no hullabaloo when that happens.
From Seattle Times
Devised in 1972 and used 27 times since, the leap second wreaks havoc with modern-day telecommunications, banking, and other networks.
From Science Magazine
Since 1972, whenever the two time systems have drifted apart by more than 0.9 seconds, a leap second has been added.
From Scientific American
The time has come — or will come, in 2035 — to abandon the leap second.
From New York Times
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