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decennial

[dih-sen-ee-uh l] /dɪˈsɛn i əl/
adjective
1.
of or for ten years.
2.
occurring every ten years.
noun
3.
a decennial anniversary.
4.
its celebration.
Origin
1650-1660
1650-60; < Latin decenni(um) a period of ten years (decenn(is) decennary + -ium -ium) + -al1
Related forms
decennially, adverb
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for decennially

decennial

/dɪˈsɛnɪəl/
adjective
1.
lasting for ten years
2.
occurring every ten years
noun
3.
a tenth anniversary or its celebration
Derived Forms
decennially, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for decennially

decennial

adj.

1680s, from Latin decennium, from decennis "of 10 years," from decem "ten" (see ten) + annus "year" (see annual). For vowel change, see biennial.

Online Etymology Dictionary, © 2010 Douglas Harper
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