decennia

decennium

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

Origin:
1675–85; < Latin; see decennial

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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)
 
n
 
[C17: from Latin, from decem ten + annus year]

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