B1 the day on which an important event happened in a previous year周年纪念;周年纪念日
More examples
We are planning a dinner to celebrate the 50th anniversary of the founding of the company.
Tomorrow's parade will mark the 50th anniversary of the battle.
We went for a slap-up meal on our wedding anniversary.
It was their 25th wedding anniversary last week.
On this anniversary of the tragedy we remember the living as well as the dead.
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