名詞 quincentenary:

1. the 500th anniversary (or the celebration of it)
   同義詞：quincentennial

形容詞 quincentenary:

1. of or relating to a 500th anniversary
   同義詞：quincentennial

quin.cen.ten.a.ry

n.（名詞）
pl. quin.cen.ten.a.ries
A 500th anniversary or celebration.
五百周年：五百年紀念日或是慶祝活動
adj.（形容詞）
Of or relating to a span of 500 years or to a 500th anniversary.
五百周年紀念的：屬于或是關(guān)于滿五百年或是迎接第五百年的紀念日的

來源：
From Latin quongento, quoncento [five hundred] on the model of such words as tercentenary * see penk we
From Latin quongento, quoncento [five hundred] on the model of such words as tercentenary *參見 penk we