- 1. a. Lasting or comprising twenty years. Source: opted
- 2. a. Happening once in twenty years; as, a vicennial celebration. Source: opted
- 3. adj. occurring once every 20 years Source: wordnet
- 4. 1. Lasting or comprising twenty years. 2. Happening once in twenty years; as, a vicennial celebration. Source: webster
- 5. a occurring once every 20 years Source: ecdict
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vicennial
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