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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).
Freebase(0.00 / 0 votes)Rate this definition: Second. The second is the base unit of time in the International System of Units and is also a unit of time in other systems of measurement it is the second division of the hour by sixty, the first division by 60 being the minute.