#second__s____sec  1/60 of a minute; the basic unit of time adopted under the System International d'Unites
  supertype:  time_unit__unit_of_time  a unit for measuring time periods
  subtype:  leap_second  a second (as measured by an atomic clock) added to or subtracted from Greenwich Mean Time in order to compensate for slowing in the Earth's rotation
  part of:  minute
  part:  millisecond  one thousandth of a second
     part:  microsecond  one millionth of a second; one thousandth of a millisecond
        part:  nanosecond  one billionth of a second; one thousandth of a microsecond
           part:  picosecond  one trillionth of a second; one thousandth of a nanosecond
              part:  femtosecond  one quadrillionth of a second; one thousandth of a nanosecond
                 part:  attosecond  one quintillionth of a second; one thousandth of a femtosecond

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