rite

noun

1. a ceremonial or formal, solemn act, observance, or procedure in accordance with prescribed rule or custom, as in religious use: marriage rites
2. any formal, customary observance, practice, or procedure: the rites of courtship
3. 1. a prescribed form or particular system of ceremonial procedure, religious or otherwise; ritual: the Scottish rite of Freemasonry
   2. liturgy; esp., any of the historical forms of the Eucharistic service: the Byzantine rite
4. a division of (Eastern and Western) churches according to the liturgy used