centennial

[sen-ten-ee-uhl]
adjective
1.
pertaining to, or marking the completion of, a period of 100 years.
2.
pertaining to a 100th anniversary.
3.
lasting 100 years.
4.
100 years old.
noun
5.
a 100th anniversary or its celebration; centenary.

Origin:
1790–1800; < Latin cent- 100 (see cent) + English -ennial pertaining to a period of years (extracted from biennial)

centennially, adverb
precentennial, adjective

centenary, centennial.
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World English Dictionary
centennial (sɛnˈtɛnɪəl)
 
adj
1.  relating to, lasting for, or completing a period of 100 years
2.  occurring every 100 years
 
n
3.  chiefly (US), (Canadian) another name for centenary
 
[C18: from Latin centum hundred, on the model of biennial]
 
cen'tennially
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

centennial
c.1797, formed in Eng. from L. cent(um) "hundred" + Eng. (bi)ennial. Originally an adj., first used as a noun in 1876.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Doc, they built a dome to prepare for the centennial.
Celebrations around the world are happening this summer to commemorate the centennial.
In the zipcode directory, centennial addresses are listed under those three cities.
At the centennial, there was a beer drinking contest and a beard growing contest.
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