centenary

[sen-ten-uh-ree, sen-tn-er-ee; especially British sen-tee-nuh-ree]
adjective
1.
of or pertaining to a period of 100 years.
2.
recurring once in every 100 years: a centenary celebration.
noun, plural centenaries.
3.
a centennial.
4.
a period of 100 years; century.

Origin:
1600–10; < Latin centēnārius (adj.), equivalent to centēn(ī) a hundred each (cent(um) 100 + -ēnī distributive suffix) + -ārius -ary

centenary, centennial.
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World English Dictionary
centenary (sɛnˈtiːnərɪ)
 
adj
1.  of or relating to a period of 100 years
2.  occurring once every 100 years
 
n , -naries
3.  a 100th anniversary or its celebration
 
[C17: from Latin centēnārius of a hundred, from centēnī a hundred each, from centum hundred]

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

centenary
1607, from L. centenarius "of hundred," from centenai "a hundred each," from centum "hundred" (see hundred). Centenarian "person who is 100" is from 1846.
Online Etymology Dictionary, © 2010 Douglas Harper
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