Definitions for officiantəˈfɪʃ i ənt
Random House Webster's College Dictionary
of•fi•ci•antəˈfɪʃ i ənt(n.)
a person who officiates at a religious service or ceremony.
Origin of officiant:
1835–45; < ML officiāre to serve
a clergyman who officiates at a religious ceremony or service
A person who officiates at a religious ceremony (other than the Eucharist)