leap second

leap second
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.
[1970-75]

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Universalium. 2010.

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  • leap second — noun Date: 1971 an intercalary second added to Coordinated Universal Time to compensate for the slowing of the earth s rotation and keep Coordinated Universal Time in synchrony with solar time …   New Collegiate Dictionary

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