The Easter Triduum is often commonly referred to simply as the Triduum (with a capital T). However, a triduum is simply any three-day period of prayer, recalling the three days that Christ spent in the tomb.
Encompassing the final three days of the discipline of Lent, the Easter Triduum has traditionally been observed with even stricter fasting and abstinence, as well as prayer and almsgiving. Since 1956, however, the Paschal Triduum has been regarded as its own liturgical season, and thus liturgically Lent ends before the Mass of the Lord's Supper on Holy Thursday. (For more details, see When Does Lent End?)
The Days of the Easter Triduum:
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