anniversary
n.
early 13c., originally especially of the day of a person's death, from Medieval Latin anniversarium, from Latin anniversarius (adj.) "returning annually," from annus (genitive anni) "year" (see annual, adj.) + versus, past participle of vertere "to turn" (see versus). The adjective came to be used as a noun in Church Latin as anniversaria (dies) in reference to saints' days. An Old English word for "anniversary" (n.) was mynddæg, literally "mind-day."
〔蒋〕[ann 年 -i- 连接字母，vers 转 –ary 名词后缀；时间转了一年] 周年纪念日，周年纪念
〔蒋〕[ann年，-i-，连接字母，vers转，-ary名词后缀;’时间转了一年”] 周年纪念日，周年纪念;[-ary形容词后缀，…的] 周年纪念的，周年的
〔李〕[anni=year 年；vers=to turn 转；-ary n.=thing物→“the date connected with the turning of a year与时间周转一年相关的日子”→] n. the date of a year on which something happened周年纪念日