Definitions for vicennialvaɪˈsɛn i əl
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Random House Webster's College Dictionary
vi•cen•ni•alvaɪˈsɛn i əl(adj.)
of or for twenty years.
occurring every twenty years.
Origin of vicennial:
1730–40; < L
Princeton's WordNet
vicennial(adj)
occurring once every 20 years
Wiktionary
vicennial(Adjective)
Occurring every twenty years.
vicennial(Adjective)
Lasting twenty years.
Webster Dictionary
Vicennial(adj)
lasting or comprising twenty years
Vicennial(adj)
happening once in twenty years; as, a vicennial celebration
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