triduan

adj

1. (not-comparable)Lasting three days.

   “These Litanies are also called Rogations, and Gang Days among the Saxons, and Gang Dawes by old English writers. They are triduan, and take place on the three days before Ascension Day.”

   “Faenza having escaped their brutality by denying them entrance, its citizens testified their gratitude for the exemption, by instituting an annual triduan thanksgiving, and dotation of two of their daughters.”

   “Such tents of assignation are still in use in the pilgrimages of Islam at Mecca, and are known to have been constructed and afterwards burned on the ‘tent-day’ of the triduan festival of Isis at Tithorea in Phocis.”

   “To consider one example of his method, the connecting link of his whole argument involves his postulates of biduan and triduan periods and so their relation to the Hewbrew hebdomads.”

2. (not-comparable)Happening every third day.

   “1810 January—June, The Universal Magazine, New Series, Volume XIII, page 103, The diurnal or triduan prints are too expensive for every individual, and in consequence the weekly ones have been established; […] .”

noun

1. An event lasting three days.

   “Pius IX has defined the sacred dogma, and the Catholic world has rejoiced, and Triduans, that is, three days of special joy and holy exercises, have been celebrated throughout the wide world, and continue to be celebrated in honor of the glad event.”

   “Then they lift their hands up to heaven, and they give a blessing to God and Patrick with the saints of Ireland, and to every soul that is in the assembly of these triduans, whether alone or in a multitude.”