A liturgy's the customary public worship done by a specific religious group, according to their particular traditions. The word may refer to an elaborate formal ritual such as the Eastern Orthodox Divine Liturgy and Catholic Mass, or a daily activity such as the Muslim salat (see Oxford Dictionary of World Religions, p.582–3) and Jewish services. As a religious phenomenon, liturgy's a communal response to the sacred through activity reflecting praise, thanksgiving, supplication, or repent… (More on Liturgy)