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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 metric unit (in SI) for time is the second (s). The official definition of second is now (after CIPM): the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom; this definition refers to a caesium atom at rest at a temperature of 0 K.