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anniversary

[an-uh-vur-suh-ree]
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noun, plural an·ni·ver·sa·ries.
  1. the yearly recurrence of the date of a past event: the tenth anniversary of their marriage.
  2. the celebration or commemoration of such a date.
  3. wedding anniversary.
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adjective
  1. returning or recurring each year; annual.
  2. pertaining to an anniversary: an anniversary gift. Abbreviation: anniv.
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Origin of anniversary

1200–50; Middle English anniversarie (< Anglo-French) < Medieval Latin (diēs) anniversāria anniversary (day), Latin anniversārius recurring yearly, equivalent to anni- (combining form of annus year) + vers(us) turned, past participle of vertere (vert- turn + -tus past participle suffix) + -ārius -ary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for anniversary

anniversary

noun plural -ries
  1. the date on which an event occurred in some previous yeara wedding anniversary
  2. the celebration of this
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adjective
  1. of or relating to an anniversary
  2. recurring every year, esp on the same date
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Word Origin

C13: from Latin anniversārius returning every year, from annus year + vertere to turn
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for 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."

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Online Etymology Dictionary, © 2010 Douglas Harper