Liturgical (adjective)

1. Pertaining to or in accordance with liturgy, or the forms and ceremonies of public worship.
2. Of or relating to the form and order of public worship in a religious organization.

Origin:

From latin liturgia ("public service, worship") + -ical.

Examples:

1. The church used a liturgical calendar to plan its services.
2. The choir sang a liturgical hymn during the service.
3. The liturgical year is a way of organizing the church calendar.
4. The liturgical vestments were worn during the service.
5. The liturgical books contain the prayers and rituals used in church services.