anniversary

Borrowed from Latin adjective anniversarius (“returning yearly”), from annus (“year”) + vertere (“to turn”).

• (UK) IPA^(key): /ˌænɪˈvɜːs(ə)ɹi/
• (US) IPA^(key): /ˌænɪˈvɝs(ə)ɹi/, IPA^(key): /ˌænəˈvɝs(ə)ɹi/

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anniversary (plural anniversaries)

1. A day that is an exact number of years (to the day) since a given significant event occurred. Often preceded by an ordinal number indicating the number of years.

   Today is the fiftieth anniversary of the end of the war.

   1. (especially) Such a day that commemorates a wedding.

      We are celebrating our tenth anniversary today.

2. (loosely) A day subsequent in time to a given event by some significant period other than a year (especially as prefixed by the amount of time in question).
   • 1984, ‘Never Mind the Tranquil Facade’, Time, 27 Feb 1984:

     The occasion was the six-month anniversary of the Aug. 8 coup that brought General Óscar Humberto Mejía Victores to power.

   • 2002, ‘Politics this Week’, The Economist, 14 Mar 2002:

     In a thinly veiled threat to Saddam Hussein, President George Bush marked the six-month anniversary of September 11th by reiterating America's commitment to prevent rogue countries obtaining weapons of mass destruction.

   • 2006, DB Schrock, Soulmonger Dot Com, page 28:

     Jonathon proposed to his [Jess's] mom on their three-month anniversary of meeting and married her on their fourth.

• yearday
• yeartide (rare, nonstandard)

• dateaversary
• hebdomadiversary
• meetaversary

• birthday