Last Updated
：2025/11/19
second
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One-sixtieth of a minute; the SI unit of time, defined as the duration of 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of caesium-133 in a ground state at a temperature of absolute zero and at rest.
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second
The stopwatch measured every second as the runners raced to the finish.
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The stopwatch measured every second as the runners raced to the finish.
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