Liturgy

From the Greek word λειτουργια, which can be transliterated as "leitourgia," meaning "the work of the people," a liturgy comprises a prescribed religious ceremony, according to the traditions of a particular religion; it may refer to, or include, an elaborate formal ritual (such as the Catholic Mass), a daily activity such as the Muslim Salats, or attendance to Quaker Meeting. (see Oxford Dictionary of World Religions, p.582-3)

Source

• Bowker, John, ed. (1997) Oxford Dictionary of World Religions. Oxford University Press. ISBN 0192139657.