triduum

noun

Plural: triduums, tridua

A time interval of three days. Specifically, a holiday or festivity that lasts three days, such as Christmas (Christmas Eve, Christmas Day, and Boxing Day), Paschal Triduum (Easter), or the autumn triduum (Halloween, All Saints' / Hallows' Day, and All Souls' Day).

Examples:

But there are other three-day holidays, such as Paschal or Easter Triduum. An analogical one is, I think, from about the eighth century, if I recall correctly. It is still commonly called the Triduum by some people today. That one starts in a couple of days. As per the "Tridumations", I guess that's a local folksy term from some village in Estela's family line. Satisfied? (Source: J∙ Okram - The Mystery of the Rammed Key.)

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Julion Okram's Word Explainer is a concise dictionary of uncommon, less standard and expert words appearing in mystery thrillers and science fiction adventures. It contains little-known or fictional geographical names, scientific terms, slang, professional jargons, archaisms, dialects, neologisms, composite expressions, etc⋅. Find word definitions, alternative meanings, occasional notes about etymology and stems, and story-related contextual remarks. The entire vocabulary is searchable online. Readers wishing to go offline or have a printed reference at hand can download this full glossary as a wordbook in PDF format.