/ senˈtiːnəri; NAmE -ˈtenəri/ ( pl. -ies ) ( BrE ) (also cen·ten·nial NAmE , BrE ) noun
the 100th anniversary of an event :
The club will celebrate its centenary next year.
the centenary year
—see also bicentenary , tercentenary
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WORD ORIGIN
early 17th cent. (denoting a century): from Latin centenarius containing a hundred, based on Latin centum a hundred.