Litany
Litany is a form of prayer consisting of a series of petitions or invocations, with a repeated response by the congregation. The term comes from the Late Latin litania, from Greek litaneia, meaning supplication or prayer. In Christian liturgy, a litany is usually led by a presiding official (priest, deacon, or cantor) with the people responding, often with a standard refrain such as "Kyrie eleison" or "Lord, have mercy." It can be spoken or chanted, with occasional pauses for silent prayer.
Common structure includes a sequence of invocations, followed by a concluding collect or blessing.
There are many named litanies, such as the Litany of the Saints, the Litany of the Blessed
Historical context: Litany forms date to early Christian worship and became prominent in medieval Western liturgy.
Beyond liturgical use, "litany" has come to describe any repetitive, incantatory recital or long list of items,