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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).
Secund.]. 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. Between 1000 and 1960 the second was defined as 1/86,400 of a mean solar day.he 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.