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abstraction > mathematical concept > unit > time unit > second unit
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second unit
subjectfact 
second unitis a kind of time unit2001-09-27 09:32:53.0
time unitis a unit of time2001-09-27 09:32:52.0
unithas historical origin2001-09-27 09:32:42.0
represents2001-09-27 09:32:42.0

Kinds of second unit :