triduum

triduum

[trij-oo-uhm, trid-yoo-]
noun Roman Catholic Church.
a series of special religious observances over a three-day period, in preparation for a great feast.

Origin:
1880–85; < Latin trīduum period of three days, equivalent to trī- tri- + -duum < *diwom, akin to diēs day (long i perhaps after postrīdiē on the following day)

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World English Dictionary
triduum (ˈtrɪdjʊəm, ˈtraɪ-)
 
n
RC Church a period of three days for prayer before a feast
 
[C19: Latin, perhaps from triduum spatium a space of three days]

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