'Vicennial' definitions:

Definition of 'vicennial'

adjective

Occurring once every 20 years

Definition of 'Vicennial'

From: GCIDE

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]

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