Take your pick

"A set of fixed actions and sometimes words performed regularly, especially as part of a ceremony"
"Of or relating to rites or a ritual : Ceremonial"
"according to religious law or social custom"
" A religious or solemn ceremony involving a series of actions performed according to a set order.
" A set order of performing such a ceremony"
" A series of actions habitually and invariably followed by someone".
"A ritual is a formalised, predetermined set of symbolic actions generally performed in a particular environment at a regular, recurring interval. The set of actions that comprise a ritual often include, but are not limited to, such things as recitation, singing, group processions, repetitive dance, manipulation of sacred objects, etc. The general purpose of rituals is to express some fundamental truth or meaning, evoke spiritual, numinous emotional responses from participants, and/or engage a group of people in unified action to strengthen their communal bonds".