WordReference Random House Learner's Dictionary of American English © 2017
an•ni•ver•sa•ry /ˌænəˈvɜrsɚi/USA pronunciation   n., pl.  -ries, adj. 
n. [countable]
  1. the date of an important past event that is celebrated or remembered every year:That date was the anniversary of the invasion.
  2. the celebration of an anniversary, esp. of a wedding:had 200 guests at their anniversary.

adj. [before a noun]
  1. of or relating to an anniversary:an anniversary party.
See -ann-.
WordReference Random House Unabridged Dictionary of American English © 2017
an•ni•ver•sa•ry  (an′ə vûrsə rē),USA pronunciation n., pl.  -ries, adj. 
  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. See  wedding anniversary. 

  1. returning or recurring each year;
  2. pertaining to an anniversary:an anniversary gift. Abbr.:anniv.
  • 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
  • Anglo-French)
  • Middle English anniversarie ( 1200–50

Collins Concise English Dictionary © HarperCollins Publishers::

anniversary /ˌænɪˈvɜːsərɪ/ n ( pl -ries)
  1. the date on which an event occurred in some previous year: a wedding anniversary
  2. the celebration of this
  1. of or relating to an anniversary
Etymology: 13th Century: from Latin anniversārius returning every year, from annus year + vertere to turn

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