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decennium

[dih-sen-ee-uh m] /dɪˈsɛn i əm/
noun, plural decenniums, decennia
[dih-sen-ee-uh] /dɪˈsɛn i ə/ (Show IPA)
1.
a period of ten years; a decade.
Origin
1675-1685
1675-85; < Latin; see decennial
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for decennium

decennium

/dɪˈsɛnɪəm/
noun (pl) -niums, -nia (-nɪə), -naries
1.
a less common word for decade (sense 1)
Word Origin
C17: from Latin, from decem ten + annus year
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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