decennium

[dih-sen-ee-uhm]

de·cen·ni·um

[dih-sen-ee-uhm]
noun, plural de·cen·ni·ums, de·cen·ni·a [-sen-ee-uh] .
a period of ten years; a decade.

Origin:
1675–85; < Latin; see decennial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Decennium is always a great word to know.
So is callithumpian. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a chattering or flighty, light-headed person.
Collins
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)
 
n
 
[C17: from Latin, from decem ten + annus year]

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