#decade__decennary__decennium  a period of 10 years
  supertype:  #time_period__period__period_of_time  an amount of time; "a time period of 30 years"; "hastened the period of his recovery"
  instance:  #1900s  #1530s  #twenties  #1820s  #thirties  #1830s  #forties  #1840s  #fifties  #1850s  #1750s  #sixties  #1860s  #1760s  #seventies  #1870s  #1770s  #1980s  #eighties  #1780s  #1990s  #nineties  #1790s
  part:  #twelvemonth
  part of:  #century  100 years
     part of:  #millennium  a span of 1000 years

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