an·ni·ver·sa·ry 
/ˌænəˈvɚsəri/ noun
plural an·ni·ver·sa·ries /ˌænəˈvɚsəri/ noun [count] : a date that is remembered or celebrated because a special or notable event occurred on that date in a previous year
▪ the anniversary of the invasion/attack ▪ We are celebrating our fifth (wedding) anniversary this year. = We are celebrating the fifth anniversary of our wedding this year. ▪ The exhibit will close on the 100th anniversary of the artist's death. — often used before another noun ▪ an anniversary party/celebration/dinner
▪ the anniversary of the invasion/attack ▪ We are celebrating our fifth (wedding) anniversary this year. = We are celebrating the fifth anniversary of our wedding this year. ▪ The exhibit will close on the 100th anniversary of the artist's death. — often used before another noun ▪ an anniversary party/celebration/dinner
