#millisecond  one thousandth of a second
  supertype:  time_unit__unit_of_time  a unit for measuring time periods
  part of:  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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