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SI unit of time, defined as 9 192 631 770 periods of the ground-state hyperfine transitions of caesium-133
The second is the unit of time in the International System of Units (SI), historically defined as 1⁄86400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). "Minute" comes from the Latin, meaning "first small part", and "second" comes from the, "second small part". Wikipedia