anniversary

/ˌænəˈvərsəri/

the date on which an event occurred in some previous year (or the celebration of it)

中文释义：周年纪念日

They celebrated their tenth wedding anniversary with a trip to Paris.

他们去巴黎旅行庆祝结婚十周年纪念日。

The company marked its 50th anniversary with a grand ceremony.

公司举办了一场盛大的典礼来庆祝成立50周年。