Vicennial

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [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]

From WordNet (r) 2.0 [wn]:

  vicennial
       adj : occurring once every 20 years