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vicennial
From The Collaborative International Dictionary of English v.0.48:
Vicennial \Vi*cen"ni*al\, a. [L. vicennium a period of twenty
years; viceni twenty + annus year.]
1. Lasting or comprising twenty years.
[1913 Webster]
2. Happening once in twenty years; as, a vicennial
celebration.
[1913 Webster]
