anniversaryyoudaoicibaDictYouDict[anniversary 词源字典]
anniversary: [13] Like annual, anniversary is based ultimately on Latin annus ‘year’. The underlying idea it contains is of ‘yearly turning’ or ‘returning’; the Latin adjective anniversārius was based on annus and versus ‘turning’ (related to a wide range of English words, from verse and convert to vertebra and vertigo). This was used in phrases such as diēs anniversāria ‘day returning every year’, and eventually became a noun in its own right.
=> annual, convert, verse[anniversary etymology, anniversary origin, 英语词源]
anniversary (n.)youdaoicibaDictYouDict
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."