Definition of anniversary in English:

anniversary

Syllabification: an·ni·ver·sa·ry
Pronunciation: /ˌanəˈvərs(ə)rē
 
/

noun (plural anniversaries)

1The date on which an event took place in a previous year: the 50th anniversary of the start of World War II [as modifier]: anniversary celebrations
More example sentences
  • In 2000, The New Yorker Festival was inaugurated to mark the magazine's seventy-fifth anniversary.
  • Today is the anniversary of the seige of the Alamo.
  • This year marks the 10th anniversary of his pro debut.
1.1The date on which a country or other institution was founded in a previous year: Canada’s 125th anniversary
More example sentences
  • Now JetBlue's offering a bonanza of deals, in honor of the airline's fifth anniversary.
  • In fact, at the high school's anniversary next year, they were planning to have her as a keynote speaker.
  • The college is currently in preparations for the 100th year anniversary of its opening in 1906.
1.2The date on which a couple was married in a previous year: he even forgot our tenth anniversary!
More example sentences
  • Who else can say they got divorced on the tenth anniversary of their wedding?
  • No matter how old you are it is important not to forget your wedding anniversary as Pat Evans found out to his cost last week.
  • A couple approaching their golden anniversary have thanked the Lord for 50 years of marital bliss.
1.3 informal The date on which a romance began in a previous month or week.
More example sentences
  • It was only when she forgot about their one month anniversary that his true nature began to surface.
  • One theme that crops up week after week are those who hit their 5 or 6 month anniversary.
  • Things progressed in this same manner, until about a week after our 3 month anniversary.

Origin

Middle English: from Latin anniversarius 'returning yearly', from annus 'year' + versus 'turning'.

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