decennial

[dih-sen-ee-uhl]
adjective
1.
of or for ten years.
2.
occurring every ten years.
noun
3.
a decennial anniversary.
4.
its celebration.

Origin:
1650–60; < Latin decenni(um) a period of ten years (decenn(is) decennary + -ium -ium) + -al1

decennially, adverb
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World English Dictionary
decennial (dɪˈsɛnɪəl)
 
adj
1.  lasting for ten years
2.  occurring every ten years
 
n
3.  a tenth anniversary or its celebration
 
de'cennially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

decennial
1680s, from L. decennium, from decennis "of 10 years," from decem "ten" (see ten) + annus "year" (see annual).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
So long as anti-Ahmadi sentiment is sanctioned by law, there is little prospect of breaking the decennial cycle.
First, the decennial census counts residents, not citizens.
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