quadranscentennial

English

From Latin quadrans, from quadrans (“quarter”) + -ennium (compare annus (“year”)) + -ālis.

quadranscentennial (plural quadranscentennials)

The twenty-fifth anniversary of an event or happening.
Synonym: (informal) silver jubilee
- 2017 December 22, James Higham, “Transforming societies and transforming tourism: sustainable tourism in times of change”, in Journal of Sustainable Tourism, volume 26, number 1:
  It is a year since we marked the twenty-fifth anniversary of the Journal of Sustainable Tourism, noting then that as we “embark upon the next quadranscentennial… we recognise that the 25 years ahead present a new order of challenges confronting sustainable development and sustainable tourism”.

quadranscentennial (not comparable)

Occurring every twenty-five years.
- 2014, Michael Gose, Common Sense: What It Means to Be a Teacher, page 166:
  So when I planned a Quadranscentennial Pnyx, the quadranscentennial gives away that I had otherwise learned my lesson not to undertake such ventures, because I would not be prepared to undertake another for 25 years, when I expect to still be teaching at the age of 91.
Of or related to a twenty-five-year period.