Liturgy (noun)

1. The form or formulary according to which public religious worship, especially Christian worship, is conducted.
2. A rite or body of rites prescribed for public worship.

Origin:

From late latin liturgia, from greek leitourgia "public service, duty to the people", from leitourgos "public servant".

Examples:

1. The liturgy for the Mass includes the Kyrie, Gloria, and Agnus Dei.
2. The Eastern Orthodox Church has a rich liturgical tradition.
3. The book contains the liturgies for the major Christian festivals.
4. The priest led the congregation in the liturgy of the Eucharist.
5. The liturgy was conducted in Latin, a language that most of the congregation did not understand.