Leap-second meaning

lēp
A second of time, as measured by an atomic clock, added to or omitted from official timekeeping systems periodically to compensate for small changes in the rotation of the earth and therefore the length of a solar day.
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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.
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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.
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