officiant; presider
Formal term for the person who conducts or presides over a ceremony, especially weddings or religious rites.
The officiant at the wedding was a friend of the bride and groom.
The church officiant conducted the ceremony.
Compound of 司 (preside over), 式 (ceremony), and 者 (person). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning.