quincentennial

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quin·cen·ten·ni·al

 (kwĭn′sĕn-tĕn′ē-əl)
adj.
Quincentenary.
n.
A quincentenary event or celebration.

quin•cen•ten•ni•al

(ˌkwɪn sɛnˈtɛn i əl)

adj.
1. pertaining to or marking a period of 500 years.
n.
2. a 500th anniversary or its celebration.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.quincentennial - the 500th anniversary (or the celebration of it)
anniversary, day of remembrance - the date on which an event occurred in some previous year (or the celebration of it)
Adj.1.quincentennial - of or relating to a 500th anniversary; "the quincentennial celebration of the founding of the city"