decennium

play
noun de·cen·ni·um \-nē-əm\

Definition of decennium

plural

decenniums

or

decennia

play \-nē-ə\
  1. :  a period of 10 years :  decade

Origin and Etymology of decennium

Latin, from decem + annus year — more at annual


First Known Use: 1685

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