Found 2 items, similar to vicennial.
English → English (WordNet) Definition: vicennial vicennial adj : occurring once every 20 years
English → English (gcide) Definition: Vicennial 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]