quincentennial

quin·cen·ten·ni·al

Q0033475 (kwĭn′sĕn-tĕn′ē-əl)adj. Quincentenary.n. A quincentenary event or celebration.

(ˌkwɪn sɛnˈtɛn i əl)

adj. 1. pertaining to or marking a period of 500 years. n. 2. a 500th anniversary or its celebration.

Thesaurus

Noun	1.	quincentennial - the 500th anniversary (or the celebration of it)quincentenaryanniversary, 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"quincentenary