#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 of:  century
  part:  twelvemonth__yr  a period of time containing 365 (or 366) days; "she is 4 years old"

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