From Middle English anniversary, from Medieval Latin anniversāria, anniversārium, from anniversārius, from annus ("year") + versus, past participle of vertere ("to turn").

• (British) IPA: /ˌænɪˈvɜːs(ə)ɹi/
• (America) IPA: /ˌænɪˈvɝs(ə)ɹi/, /ˌænəˈvɝs(ə)ɹi/

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).
   • 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

• French: anniversaire
• German: Jahrestag
• Italian: anniversario
• Portuguese: aniversário
• Russian: годовщи́на
• Spanish: aniversario

• French: anniversaire de mariage
• German: Hochzeitstag
• Portuguese: aniversário de casamento, bodas
• Russian: юбиле́й