#hour__hr__60_minutes  a period of time equal to 1/24th of a day; "the job will take more than an hour"
  supertype:  #time_unit__unit_of_time  a unit for measuring time periods
  subtype:  #sidereal_hour  #man_hour
  part of:  #day
  part:  #half-hour__30_minutes  a half of an hour
  part:  #quarter-hour__quarterhour__15_minutes  a quarter of an hour
  part:  #minute__min  a unit of time equal to 60 seconds or 1/60th of an hour; "he ran a 4 minute mile"
     part:  #second__s____sec  1/60 of a minute; the basic unit of time adopted under the System International d'Unites
        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
  part:  #quarter.time_unit  a unit of time equal to 15 minutes or a quarter of an hour; "it's a quarter til 4"; "a quarter after 4 o'clock"

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