纪念日 (紀念日) jìniànrì

jìniànrì noun day of commemoration; memorial day
Domain: Modern Chinese 现代汉语 , Subdomain: Time
Notes: (CC-CEDICT '紀念日'; Guoyu '紀念日'; Mathews 1931 '紀念日', p. 57)

Also contained in

结婚纪念日