centennials

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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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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