triduan

— 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.

— It seems to be a kind of understanding or unwritten compact between the orator and the audience, that he be allowed to talk without interruption as much as he pleases, so long as they are not called upon to listen to one word that he utters. Accordingly, during the delivery of one of these triduan discourses, the Senate of the United States wears the appearance of an orderly well-regulated reading-room; the members being comfortably seated in their arm-chairs, some looking over and answering private letters, some exchanging a few words in a low whisper with each other, or with friends in the strangers' gallery, others reading a newspaper, and all evincing the most philosophic indifference to the tedious harangue and the exhaustless lungs of the orator.

— 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; […] .