A Triduum is "A period of three days of prayer, either preceding some special feast or preparing for some major enterprise. [It] Commemorates the biblical three days that Christ lay in the tomb." (from Modern Catholic Dictionary by Fr. Hardon, S.J. In the Catholic Church it is used most frequently to refer to the Easter (or Sacred) Triduum, which is composed of the last three days of Holy Week, i.e.: Holy Thursday, Good Friday, and Holy Saturday. The Easter Triduum ends with the lighting of the Easter fire at the beginning of the Easter Vigil after dark on Holy Saturday night.
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In the Paschal Triduum there is Holy Thursday, Good Friday, and Easter Vigil. (the Thursday, Friday, and Saturday before Easter.)