One of the mysteries of the English language finally explained.
A period of a hundred years; a century. Also (occasionally): a celebration of the completion of a century; a centenary.
Early 19th century; earliest use found in Augustus Granville (1783–1872), physician and Italian patriot. From post-classical Latin centennium period of a hundred years from classical Latin centum hundred + -ennium (in biennium, triennium, etc.).
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