| NOUN | time | leap second | 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 |
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| Meaning | 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. | |
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| Broader | second, sec, s | 1/60 of a minute |
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