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centennial

[sen-ten-ee-uh l] /sɛnˈtɛn i əl/
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
1790-1800; < Latin cent- 100 (see cent) + English -ennial pertaining to a period of years (extracted from biennial)
Related forms
centennially, adverb
precentennial, adjective
Can be confused
centenary, centennial.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for precentennial

centennial

/sɛnˈtɛnɪəl/
adjective
1.
relating to, lasting for, or completing a period of 100 years
2.
occurring every 100 years
noun
3.
(mainly US & Canadian) another name for centenary
Derived Forms
centennially, adverb
Word Origin
C18: from Latin centum hundred, on the model of biennial
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for precentennial

centennial

adj.

1789, from Latin centum "one hundred" (see hundred) + ending from biennial. As a noun, "hundredth anniversary celebration," from 1876; the older noun is centenary.

Online Etymology Dictionary, © 2010 Douglas Harper
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