an established ceremony prescribed by a religion

conforming to set usage, procedure, or discipline

perform duties attached to a particular office or place or function

act in an official capacity in a ceremony or religious ritual, such as a wedding

canonical prayers recited daily by priests (e.g. the breviary of the Roman Catholic Church)

a Roman Catholic office honoring the Virgin Mary; similar to but shorter than the Divine Office

an office read or sung before a burial mass in the Roman Catholic Church