annin.
/ˈani/, U.S. /ˈæni/ Chiefly colloquial in later use.
Short for anniversary n.
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the world > time > particular time > an anniversary > [noun]
anniversaryc1230
year's daya1393
year-day1431
birthday1556
anniversary day1567
anniverse1618
anniversal1635
anni1890
1890 List of Additions (Columbia Coll. Libr.) Apr. 9 New England Soc. Anni. celebrations.
1979 Colorado Springs Gaz. Tel. 28 Mar. 11 h/4 (advt.) 1978 Corvette. Silver anni edition.
2015 @oyanoire 27 Mar. in twitter.com (accessed 24 May 2019) I'm devastated because I lost the necklace my bf gave me for our first anni and his first response is ‘okay baby I'll get you a better one’.
This is a new entry (OED Third Edition, June 2022).
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n.1890