• relating to or used for formal events of a religious or public nature.

  "ceremonial robes"

  synonyms: formal, official, state, public;

• (of a position or role) involving only nominal authority or power.

  "originally a ceremonial post, it is now a position with executive power"

• the system of rules and procedures to be observed at a formal or religious occasion.

  "the procedure was conducted with all due ceremonial"

Sources: Google