Officiate v. i. : To act as an officer in performing a duty; to transact the business of an office or public trust; to conduct a public service.

Officiate v. t. : To discharge, perform, or supply, as an official duty or function.

Example:
Can catholic priest Officiate a civil marriage away from church?

Taxonomy
officiate, fi, Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, ceremony, Webster Online Dictionary with audio pronunciations, thesaurus, glossary, english, language, ESL, Search, Inflected, intransitive verb, wedding, sports.

Defination from the web:
officiate from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... intransitive verb 1 : to perform a ceremony, function, or duty <officiate at a wedding> ...