Officiate
OFFI'CIATE, verb transitive
1. To act as an officer in his office; to transact the appropriate business of an office or public trust. At this court the chief justice officiated.
The bishops and priests officiate at the altar.
2. To perform the appropriate official duties of another.
OFFI'CIATE, verb transitive To give in consequence of office.
The stars officiate light. [Improper.]