noun, plural decenniums, decennia [dih-sen-ee-uh] .
a period of ten years; a decade.

1675–85; < Latin; see decennial Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
decennium or decennary (dɪˈsɛnɪəm, dɪˈsɛnərɪ)
n , pl -niums, -nia, -naries
a less common word for decade
[C17: from Latin, from decem ten + annus year]
decennary or decennary (dɪˈsɛnɪəm, dɪˈsɛnərɪ, -nɪə)
[C17: from Latin, from decem ten + annus year]

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