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The Pentecostarion is a liturgical book used in the Eastern Church. It contains the offices for the period from Easter Sunday up to the first Sunday after Pentecost. The name "Pentecostarion" comes from the Greek word for "50th day," referencing the 50-day period following Easter. This period is significant in Christianity as it commemorates the descent of the Holy Spirit upon the disciples, an event celebrated at Pentecost.123

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