A one hundredth anniversary.
Other Word Forms of Centenary
Origin of Centenary
Attested since about 1790, from Late Latin centenarius (“of one hundred”), from Latin centeni (“one hundred each”) (from centum (“hundred”)) + -arius.
Latin centēnārius of a hundred from centum hundred dekm̥ in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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