#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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