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The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI).
The second (abbreviation, s or sec) is the Standard International (SI) unit of time. One second is the time that elapses during 9,192,631,770 (9.192631770 x 10 9) cycles of the radiation produced by the transition between two levels of the cesium 133 atom. There are other expressions for the second.