custom, usage, usance - accepted or habitual practice

ceremonial dance, ritual dance, ritual dancing - a dance that is part of a religious ritual

betrothal, espousal - the act of becoming betrothed or engaged

marriage ceremony, wedding, marriage - the act of marrying; the nuptial ceremony; "their marriage was conducted in the chapel"

rite of passage - a ritual performed in some cultures at times when a individual changes his status (as from adolescence to adulthood)

ablution - the ritual washing of a priest's hands or of sacred vessels

practice, pattern - a customary way of operation or behavior; "it is their practice to give annual raises"; "they changed their dietary pattern"

solemnisation, solemnization, celebration - the public performance of a sacrament or solemn ceremony with all appropriate ritual; "the celebration of marriage"

Communion, Holy Communion, manduction, sacramental manduction - the act of participating in the celebration of the Eucharist; "the governor took Communion with the rest of the congregation"

habit, wont, use - a pattern of behavior acquired through frequent repetition; "she had a habit twirling the ends of her hair"; "long use had hardened him to it"