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Definition of Quincentennial
1. Noun. The 500th anniversary (or the celebration of it). 
2. Adjective. Of or relating to a 500th anniversary. "The quincentennial celebration of the founding of the city"
Definition of Quincentennial
1. [n -S]
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1. Noun. The 500th anniversary (or the celebration of it). 
1. [n -S]