Nouns

(n)ritual, riteany customary observance or practice
(n)ritualthe prescribed procedure for conducting religious ceremonies
(n)ritualstereotyped behavior

Adjectives

(a)ritualof or relating to or characteristic of religious rituals“ritual killing”
(a)ritualof or relating to or employed in social rites or rituals“a ritual dance of Haiti”, “sedate little colonial tribe with its ritual tea parties” (Nadine Gordimer)