纪念日 jìniànrì day of commemoration
day of commemoration; memorial day
How to remember 纪念日: 纪 discipline + 念 to think of + 日 sun = day of commemoration.
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How it is used
- A commemoration day / anniversary - 结婚纪念日 (jiéhūn jìniànrì) wedding anniversary; 国庆纪念日 national day.
- Specifically a date set aside to commemorate something. For a birthday you use 生日, but a wedding/founding anniversary is 纪念日.