noun, plural anniversaries.
the yearly recurrence of the date of a past event: the tenth anniversary of their marriage.
the celebration or commemoration of such a date.
returning or recurring each year; annual.
pertaining to an anniversary: an anniversary gift. Abbreviation: anniv.

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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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
3.  of or relating to an anniversary
4.  recurring every year, esp on the same date
[C13: from Latin anniversārius returning every year, from annus year + vertere to turn]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 13c., from L. anniversarius "returning annually," from annus (gen. anni) "year" (see annual) + versus, pp. of vertere "to turn" (see versus). The adj. came to be used as a noun in Church L. as anniversaria (dies) in ref. to saints' days.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nothing is so sublime for the media as a first anniversary.
When the anniversary arrived, both parties were punctual to their engagement.
It's the 40th anniversary of the first humans setting foot on the moon.
The couple will celebrate their ten year anniversary this May 3rd.
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