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Noun: decennium (decennia,decenniums)  di'se-nee-um
  1. A period of 10 years
    "The company celebrated its decennium with a grand party";
    - decade, decennary [archaic]

Derived forms: decenniums, decennia

Type of: period, period of time, time period, time span

Part of: century

Encyclopedia: Decennium