anniversary

anniversary
(pl. -ies)
  1. the date on which an event took place in a previous year
    周年纪念日
    the 50th anniversary of the Battle of Britain.
    不列颠之战50周年纪念日。
    ■the date on which a country or other institution was founded in a previous year
    建国周年纪念日;成立周年纪念日
    the 75th anniversary of the RAF.
    皇家空军成立75周年庆。
    ■the date on which a couple were married in a previous year
    结婚纪念日
    he even forgot our tenth anniversary!.
    他甚至忘了我们结婚十周年纪念的日子!。
语源
  1. Middle English : from Latin anniversarius 'returning yearly', from annus 'year' + versus 'turning'
英语宝典
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