Preposition: of

• founding: In 1998 a special garden party celebrated the 50th anniversary of the founding of the National Health Service.

• liberation: It is the anniversary of the liberation of Auschwitz.

• d-day: In 1994 the museum was expanded to mark the 50th anniversary of D-Day.

Converse of object

• commemorate: Stop Press... There will be a special Lottery draw to commemorate the 25th anniversary, with a top prize of £ 2500.

• celebrate: A novel way of celebrating an anniversary or throwing a party?

• mark: In 1959, he marked the anniversary of the 1859 Revival with a series on Revival.

Adjective modifier

• 50th: A party is planned for Baby's 50th anniversary, too.

• 60th: About us 60 years celebrating the arts 60th 2006 marks the 60th anniversary of the granting of the royal charter to the Arts Council.

• 40th: In spring of 2001 we shall celebrate the 40th anniversary of the first flight of man to the outer space.

• 25th: The Band will celebrate its 25th anniversary in October, 2005!

• 10th: Its also our 10th anniversary at our Oldham St premises.

• tenth: The tenth anniversary of Fidel makes me realize how far we have come in such a short time.

Modifies a noun

• celebration: The 50th anniversary celebrations next month will see the launch of 50 balloons.

• gift: Short on ideas for a birthday or anniversary gift too?

Noun used with modifier

• 90th: The 90th anniversary of the Battle of the Somme is on 1 July 2006.

• th: We hope to have the bus early in 2007 our 20 th anniversary year.

• wedding: A 50th wedding anniversary party is usually going to require more complex planning than a small backyard barbecue party.

• 900th: The great west window and the rose window date from the early eighteenth century and remarkably in 1965 the Abbey celebrated its 900th anniversary.

• ten-year: The book was launched to coincide with the Bradford Dementia Group's ten-year anniversary.

• tenth: Then comes the official tenth anniversary concert at the Usher Hall on 17 September.