(n.) An established formula for public worship\, or the entire ritual for public worship in a church which uses prescribed forms; a formulary for public prayer or devotion. In the Roman Catholic Church it includes all forms and services in any language, in any part of the world, for the celebration of Mass.

Mass baccalaureate service bedtime prayer camp meeting celebration ceremonial ceremony church church service commencement compline convocation devotions divine service duty empty formality evening devotions evensong exercise exercises form form of worship formal formality formula formulary function graduation graduation exercises holy rite inaugural inauguration initiation institution lauds matins meeting mode of worship morning devotions mummery mystery night song none nones novena observance office order of worship ordinance performance practice praise meeting prayer prayer meeting prayers prescribed form prime prime song public worship religious ceremony revival revival meeting rite rite de passage rite of passage ritual ritual observance rituality sacrament sacramental service sext solemnity solemnization tent meeting tierce undersong vesper vespers vigils watch meeting watch night watch-night service