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centenary (adj.)

1640s, "relation to or consisting of 100 years," from Latin centenarius "of a hundred, relating to a hundred," from centenai "a hundred each," from centum "hundred" (see hundred).

As a noun, c. 1600 as "period of 100 years;" 1788 as "a hundredth anniversary, commemoration or celebration of a hundredth anniversary." The usual British word in this sense for the American centennial.

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Definitions of centenary from WordNet
1
centenary (n.)
the 100th anniversary (or the celebration of it);
Synonyms: centennial
2
centenary (adj.)
of or relating to or completing a period of 100 years;
Synonyms: centennial
From wordnet.princeton.edu